Browsing by Title

Sort by: Order: Results:

Now showing items 16-35 of 67
  • Tuomisto, Pirkko (Evira, 2009)
    The drive for risk-based food safety management, systems and control has spread world-wide in recent decades. Since the term is still internationally undefined, its use and implementation vary, producing different realizations. In this Ph.D. thesis, microbiological risk assessment (MRA) was investigated as a basis for risk-based food safety management, which was defined as ‘food safety management based on risk assessment in order to achieve an appropriate level of protection (ALOP)’. Governments are responsible for commissioning MRAs and also for setting food safety targets up to a certain point, but the practical management measures that need to be in place in order to achieve the targets are to be addressed by the operators. On the plant level, food safety is usually managed through regulation, quality assurance systems and a hazard analysis and critical control point (HACCP) programme with its prerequisites. In Finland, food safety management on the food plant level is implemented through an HACCP-like regulated system termed an ownchecking (OC) programme. A quantitative microbiological risk assessment (QMRA) was conducted on salmonella in the beef production chain according to the official standards of the Codex Alimentarius Commission (Codex Alimentarius), and utilized in determining the food safety metrics for beef production. The Finnish Salmonella Control Programme (FSCP) and the main official interventions due to it were examined in the light of risk-based food safety management. The targets set for beef processing plants by the government were converted into quantitative limits, and the results of salmonella monitoring included in the FSCP were examined by the QMRA. The goal of the FSCP was declared in 1994 to ‘maintain the present salmonella situation’, which was considered to refer to the salmonella incidence in humans at that time, and also the de facto ALOP. The requirement for a maximum salmonella prevalence of 1% at defined stages of the beef production chain was embodied in the FSCP. This statement was considered to convey performance objectives (PO) for the aforementioned stages. According to the QMRA, the de facto ALOP was achieved in the referred year 1999, and even the true prevalence levels in the FSCP were estimated to be clearly under the set PO limits with 95% credibility. However, the PO limits were set too high for the de facto ALOP to be maintained in practice. If the salmonella prevalence reached the PO limit of 1% or values near it, the public health risk would increase and overrun the de facto ALOP. The QMRA produced in this work has for the first time provided the possibility to quantitatively asses the relationships between targets set in the FSCP and their impact on public health. At present, imports of beef and beef-derived foods may impose on Finnish consumers a significantly greater exposure than domestic products. If their salmonella prevalence or their share of the foods consumed in Finland increase, the number of human cases could rapidly rise. The models for the QMRA were mainly Bayesian hierarchical models using Markov chain Monte Carlo (MCMC) techniques, which was found to be a flexible and appropriate method for this type of complex modelling. The resulting distributions were also regarded as an advantage compared to the results from models developed with the deterministic approach, because the presentation of results included the extent of the uncertainty, and also in this manner better illustrated the actual operational environment. Based on an inquiry, the personnel in food processing plants had a positive attitude towards food safety management systems, but the knowledge, training and involvement of those employees directly operating on the site with these systems were discovered to be deficient. Therefore, a generic semi-quantitative hygiene risk assessment model, Hygram®, was developed for small and medium-sized food enterprises to offer assistance in understanding, training, and, first of all, detecting the critical steps of the processes, and thereby to contribute to the development of their own-checking systems towards risk-based food safety management. Hygram® was not considered a risk-based tool as such, but whenever the critical limits of the process have been defined as equal to a risk assessment, Hygram® can be used as a risk-based management tool. It can also serve as a tool for systematic hazard analysis and CCP detection when establishing a food safety management system. To conclude, the development of risk-based food safety management is a process in which risk assessment is an essential tool. Scientific, technical, psychological and resource-bound barriers need to be overcome in order to put risk-based management systems into practice. This study showed that QMRA can be valuable in national risk management decision making, although few QMRAs are currently available. Appropriate tools for practical risk management decision making on the industrial level, such as Hygram®, need to be further developed.
  • Tuominen, Pirkko (Evira, 2008)
    The drive for risk-based food safety management, systems and control has spread world-wide in recent decades. Since the term is still internationally undefined, its use and implementation vary, producing different realizations. In this Ph.D. thesis, microbiological risk assessment (MRA) was investigated as a basis for risk-based food safety management, which was defined as ‘food safety management based on risk assessment in order to achieve an appropriate level of protection (ALOP)’. Governments are responsible for commissioning MRAs and also for setting food safety targets up to a certain point, but the practical management measures that need to be in place in order to achieve the targets are to be addressed by the operators. On the plant level, food safety is usually managed through regulation, quality assurance systems and a hazard analysis and critical control point (HACCP) programme with its prerequisites. In Finland, food safety management on the food plant level is implemented through an HACCP-like regulated system termed an ownchecking (OC) programme. A quantitative microbiological risk assessment (QMRA) was conducted on salmonella in the beef production chain according to the official standards of the Codex Alimentarius Commission (Codex Alimentarius), and utilized in determining the food safety metrics for beef production. The Finnish Salmonella Control Programme (FSCP) and the main official interventions due to it were examined in the light of risk-based food safety management. The targets set for beef processing plants by the government were converted into quantitative limits, and the results of salmonella monitoring included in the FSCP were examined by the QMRA. The goal of the FSCP was declared in 1994 to ‘maintain the present salmonella situation’, which was considered to refer to the salmonella incidence in humans at that time, and also the de facto ALOP. The requirement for a maximum salmonella prevalence of 1% at defined stages of the beef production chain was embodied in the FSCP. This statement was considered to convey performance objectives (PO) for the aforementioned stages. According to the QMRA, the de facto ALOP was achieved in the referred year 1999, and even the true prevalence levels in the FSCP were estimated to be clearly under the set PO limits with 95% credibility. However, the PO limits were set too high for the de facto ALOP to be maintained in practice. If the salmonella prevalence reached the PO limit of 1% or values near it, the public health risk would increase and overrun the de facto ALOP. The QMRA produced in this work has for the first time provided the possibility to quantitatively asses the relationships between targets set in the FSCP and their impact on public health. At present, imports of beef and beef-derived foods may impose on Finnish consumers a significantly greater exposure than domestic products. If their salmonella prevalence or their share of the foods consumed in Finland increase, the number of human cases could rapidly rise. The models for the QMRA were mainly Bayesian hierarchical models using Markov chain Monte Carlo (MCMC) techniques, which was found to be a flexible and appropriate method for this type of complex modelling. The resulting distributions were also regarded as an advantage compared to the results from models developed with the deterministic approach, because the presentation of results included the extent of the uncertainty, and also in this manner better illustrated the actual operational environment. Based on an inquiry, the personnel in food processing plants had a positive attitude towards food safety management systems, but the knowledge, training and involvement of those employees directly operating on the site with these systems were discovered to be deficient. Therefore, a generic semi-quantitative hygiene risk assessment model, Hygram®, was developed for small and medium-sized food enterprises to offer assistance in understanding, training, and, first of all, detecting the critical steps of the processes, and thereby to contribute to the development of their own-checking systems towards risk-based food safety management. Hygram® was not considered a risk-based tool as such, but whenever the critical limits of the process have been defined as equal to a risk assessment, Hygram® can be used as a risk-based management tool. It can also serve as a tool for systematic hazard analysis and CCP detection when establishing a food safety management system. To conclude, the development of risk-based food safety management is a process in which risk assessment is an essential tool. Scientific, technical, psychological and resource-bound barriers need to be overcome in order to put risk-based management systems into practice. This study showed that QMRA can be valuable in national risk management decision making, although few QMRAs are currently available. Appropriate tools for practical risk management decision making on the industrial level, such as Hygram®, need to be further developed.
  • Hallikainen, Anja; Rautala, Taneli; Karlström, Ulla; Kostamo, Pirkko; Koivisto, Pertti; Pohjanvirta, Raimo; Hietaniemi, Veli; Rajakangas, Liisa; Tuomaala, Vesa; Kankaanpää, Harri; Verta, Matti; Kostiainen, Eila; Kurttio, Päivi; Turtiainen, Tuukka; Kiviranta, Hannu; Komulainen, Hannu; Rantakokko, Panu; Viluksela, Matti; Niemi, Esko; Nuotio, Kirsti; Siivinen, Kalevi (Evira, 2009)
    Elintarvikkeiden ja talousveden kemialliset vaarat kuvataan nyt uusitussa muodossa. Raportissa käsitellään 40 vierasainetta tai –ryhmää, ja saadaan samalla kertaa kuva koko ongelmakentästä. Kaikki raporttiin valitut kemialliset yhdisteet ovat olleet viime vuosina mukana elintarvikkeiden ja/tai talousveden riskinhallintaa käsittelevissä valmisteluissa tai toimenpiteissä sekä kansallisella että EU-tasolla. Kemiallisista vaaroista oli suurimmasta osasta runsaasti tietoa saatavilla: esiintyminen elintarvikkeissa, tutkimukset ja saantilaskelmat, terveydelliset haittavaikutukset ja valvontaan liittyvät tarpeet ja lopuksi kattavat kirjallisuuskatsaukset. Yhteensä 21 suomalaista kutsuttua vierasaineasiantuntijaa on ollut mukana eri sektoritutkimuslaitoksista tämän raportin sisällön kirjoittamis- ja tarkistamistyössä. Lisäksi suuri joukko muita asiantuntijoita on kommentoinut raporttia. Asiantuntijat ovat eri hallinnonaloilta, ja osa aiheistakin ja niihin liittyvistä vierasaineista, kuten talousveden vierasaineet, kuuluvat hallinnollisesti muihin kuin maa- ja metsätalousministeriön alaisiin asiantuntijalaitoksiin. Tämä raportti on tehty mahdollisimman laajalle käyttäjäkunnalle ottaen huomioon viranomaiset sekä kuluttajat ja opetus- ja tutkimuslaitokset. Raportti on tehty helppokäyttöiseksi ja mahdollisimman selkeäksi ja lyhytsanaiseksi monine taulukkoineen ja kuvineen. Tarkoitus on, että siitä löytyy helposti eri vierasaineiden ominaisuuksia, joita voi tarvittaessa vertailla. Siitä voi etsiä uusimmat tutkimustulokset ja kansainväliset riskinarvioinnit sekä löytää vierasaineiden pitoisuustietoja etenkin kotimaisista elintarvikkeista. Arvioituja vierasainesaantimääriä voi verrata vierasaineille asetettuihin siedettäviin enimmäissaantimääriin tai vaikkapa verrata näitä turvallisuutta kuvaavia suureita eri vierasaineiden kesken. Valvontaviranomaiset voivat löytää lisäksi nopeasti tietoa lainsäädännöstä ja suositelluista valvontatoimenpiteistä. Valvontaan ja muuhun riskinhallintaan liittyvät ehdotukset ovat syntyneet yhteistyössä valvonnasta vastaavien Eviran asiantuntijoiden kanssa.
  • Hallanvuo, Saija; Johansson, Tuula (Evira, 2010)
    Opas sisältää perustietoa Suomen kannalta merkittävistä elintarvikkeisiin liittyvistä taudinaiheuttajista: bakteereista, viruksista, loisista ja prioneista. Oppaassa on kuvattu aiheuttajakohtaisesti terveydellisiä haittavaikutuksia, esiintymistä ihmisissä, eläimissä, elintarvikkeissa ja ympäristössä, raportoituja epidemioita Suomesta ja ulkomailta, ruokamyrkytykseen johtaneita tekijöitä ja valvontaa. Valvontaa tarkastellaan elintarvikkeen koko elinkaaren ajalta ja pyritään osoittamaan ne "pellolta pöytään" -ketjun riskikohdat, joissa saastuminen ja mikrobien lisääntyminen yleensä tapahtuu. Valvontatoimenpiteisiin ryhdyttäessä on kuitenkin aina tarkistettava ajantasainen lainsäädäntö. Opas on päivitetty versio EVI-EELA julkaisusta 1/2003 (Opas elintarvikkeiden ja talousveden mikrobiologista vaaroista).
  • Schulman, Kitty; Sahlström, Leena; Heikkilä, Jaakko (Evira, 2014)
    Ur djursjukdomsfaro- och smittsskyddssynvinkel är utegångskravet för ekologisk kalkon den största skillnaden mellan ekologisk och konventionell kalkonuppfödning. Smittspärrar mellan omgivningen och produktionsutrymmena kan inte tillämpas lika heltäckande utomhus som i konventionella produktionsanläggningar. Utegående kalkoner kan därför i högre grad utsättas för smittämnen från vildfåglar och gnagare samt för markburna smittämnen. Smittor påverkar kalkonernas hälsa och kan också spridas till konsumenterna via kalkonkött. Uppfödning av ängskalkoner erbjuder en mellanform mellan ekologisk och konventionell uppfödning. Smittrisker förknippade med utomhusvistelse gäller även ängskalkoner. Djursjukdomsriskerna vid betesgång kan begränsas genom kontrollåtgärder såsom skadedjursbekämpning, betesrotation och vaccination mot rödsjuka. Smittskyddet medför naturligtvis extra kostnader för producenten men dess andel av de totala rörliga kostnaderna för ekologisk produktion är ändå förhållandevis liten. Andra smittskyddsrisker inom ekologisk kalkonuppfödning är förknippade med djurstallar, utfodring och djurmaterial. Utomhusvistelse för också med sig många positiva effekter, bland annat ökad motion, lägre beläggningsgrad och bättre luftkvalitet. Med god planering och genom att tillämpa smittskyddsåtgärder kan smittriskerna minskas.
  • Lyytikäinen, Tapani; Sahlström, Leena; Kyyrö, Johanna (Evira, 2012)
    Sikojen tautitilannetta seurataan Suomessa lakisääteisesti monen taudin varalta. Tässä selvityksessä olemme arvioineet seurantaohjelmien edustavuutta Aujeszkyn, PRRS- ja TGE -tautien osalta. Näitä tauteja ei tällä hetkellä esiinny Suomessa ja AD:n ja TGE-taudin varalta Suomella onkin EU-lisävakuudet. Tautiseuranta perustuu noin tuhanteen verinäytteeseen vuosittain, jotka otetaan teurastettavista emakoista. Seurantaohjelmat ovat Suomessa toteutuneet suunnitelmien mukaisesti tarkasteltujen vuosien (2008-2009) osalta. Tulosten mukaan seurantaohjelma tunnistaa herkimmin taudeista PRRS:n, epäherkimmin TGE:n. Yksittäisenkin vuoden tulosten perusteella voidaan varmistua siitä, etteivät taudit ole muuttuneet endeemisiksi Suomessa, mutta tautivapauden osoittamiseksi yhden vuoden seurantaohjelman tulokset eivät ole riittäviä. Tautivapauden osoittaminen tehostuu, kun siihen yhdistetään myös niin sanotun passiivisen tautiseurannan havainnot, sekä arvio tautien maahantuloriskistä arviointijaksolla.
  • Nuotio, Lasse; Neuvonen, Erkki; Hyytiäinen, Mauno (BioMed Central, 2007)
    Background: Infectious bovine rhinotracheitis/infectious pustular vulvovaginitis (IBR/IPV) is a significant disease among domestic and wild cattle. The BHV-1 infection was first detected in Finland in 1970; presumably it was imported in 1968. The infection reappeared in the large-scale bulk-tank milk surveillances which started in 1990, and was eradicated in 1994. Our aim is to describe the epidemiology of this infection in Finland, and its eradication. Materials and methods: The official sources of pertinent information, the legal basis for the disease control and the serological methods for the detection of the infection are described. Results and conclusion: Ten AI bulls were found to be seropositive in 1970–1971. The total number of herds with BHV-1 antibody positive animals in the large-scale surveillance in 1990 and subsequent epidemiological investigations in 1991 was five, and the total number of seropositive animals was 90. The five herds formed three epidemiological units; semen of at least one bull seropositive in 1971 had been used in each unit. This remained the only plausible route of infection in each of the three units. Using the 'test and slaughter' approach and total stamping out in one herd the infection was eradicated in 1994.
  • Lyhs, Ulrike; Ikonen, Ilona; Pohjanvirta, Tarja; Raninen, Kaisa; Perko-Mäkelä, Päivikki; Pelkonen, Sinikka (2012)
    Background: Extraintestinal pathogenic Escherichia coli bacteria (ExPEC) exist as commensals in the human intestines and can infect extraintestinal sites and cause septicemia. The transfer of ExPEC from poultry to humans and the role of poultry meat as a source of ExPEC in human disease have been discussed previously. The aim of the present study was to provide insight into the properties of ExPEC in poultry meat products on the Finnish retail market with special attention to their prevalence, virulence and phylogenetic profiles. Furthermore, the isolates were screened for possible ESBL producers and their resistance to nalidixic acid and ciprofloxacin was tested. Methods: The presence of ExPEC in 219 marinated and non-marinated raw poultry meat products from retail shops has been analyzed. One E. coli strain per product was analyzed further for phylogenetic groups and possession of ten virulence genes associated with ExPEC bacteria (kpsMT K1, ibeA, astA, iss, irp2, papC, iucD, tsh, vat and cva/cv) using PCR methods. The E. coli strains were also screened phenotypically for the production of extended-spectrum β-lactamase (ESBL) and the susceptibility of 48 potential ExPEC isolates for nalidixic acid and ciprofloxacin was tested. Results: E. coli was isolated from 207 (94.5%) of 219 poultry meat products. The most common phylogenetic groups were D (50.7%), A (37.7%), and B2 (7.7%). Based on virulence factor gene PCR, 23.2% of the strains were classified as ExPEC. Two ExPEC strains (1%) belonged to [O1] B2 svg+ (specific for virulent subgroup) group, which has been implicated in multiple forms of ExPEC disease. None of the ExPEC strains was resistant to ciprofloxacin or cephalosporins. One isolate (2.1%) showed resistance to nalidixic acid. Conclusions: Potential ExPEC bacteria were found in 22% of marinated and non-marinated poultry meat products on the Finnish retail market and 0.9% were contaminated with E. coli [O1] B2 svg+ group. Marinades did not have an effect on the survival of ExPEC as strains from marinated and non-marinated meat products were equally often classified as ExPEC. Poultry meat products on the Finnish retail market may have zoonotic potential.
  • Solismaa, Milla; Laaksonen, Sauli; Nylund, Minna; Pitkänen, Elisa; Airakorpi, Riitta; Oksanen, Antti (BioMed Central, 2008)
    Background: In autumn 2006, Finnish meat inspection data revealed lesions in tendons, muscles and ligaments of bovine hind legs leading to partial condemnation of carcasses. In gross pathological examination at Finnish Food Safety Authority Evira, Oulu (now Fish and Wildlife Health) Research Unit, Onchocerca sp. (Filarioidea; Onchocercidae) nematodes were detected in lesions. Due to this, a pilot study was made in order to find out what filarioid nematodes do occur in cattle, horses and sheep in Finland. Methods: Ventral skin biopsies from 209 dairy cattle and 42 horses, as well as blood samples from 209 cattle, 146 horses and 193 sheep, were collected from different parts of Finland and examined for microfilariae. Visceral organs and other tissues from 33 cattle with parasitic lesions were studied histopathologically. Results: Onchocerca sp. microfilariae (mf), 240 μm long, range 225–260 μm, 5.4 μm thick, were found in 37% of the skin biopsies of cattle. All blood samples from cattle, horses and sheep and skin biopsies from horses were negative for mf. Ventral skin microfilaria prevalence in cattle was higher in southern Finland than in the North (p = 0.001). Animal age and sampling time was not associated with mf prevalence. The infection was evenly distributed among young and older animals. Macroscopic lesions on tissues included greenish-grey discolouration and often oedema. In most of the lesions, small pale nodules were seen on the fasciae. Histopathologic examination of the samples revealed mild to intense infiltration with eosinophilic granulocytes and multifocal nodular lymphoplasmacytic aggregations were seen. In some samples, there were granulomatotic lesions with central necrotic tissue and cell detritus, surrounded by eosinophilic granulocytes, lympho-, plasma- and histiocytes and some multinucleated giant cells. Around living nematodes no or only weak inflammatory changes were observed. Conclusion: Onchocerca sp. infection in cattle was found to be common in Finland, but the amount of pathological changes leading to condemnation of infected parts is low compared to the mf prevalence. Pronounced pathological changes are distinct but rare and mild changes are difficult to distinguish. No other filarioid nematodes were observed from the animals and it appears that horses and sheep may be free from filarioid nematodes in Finland.
  • Hakkinen, Marjaana (2011)
    The reported incidence of human campylobacteriosis in Finland is higher than in most other European countries. A high annual percentage of sporadic infections is of foreign origin, although a notable proportion of summer infections is domestically acquired. While chickens appear to be a major source of campylobacters for humans in most countries, the prevalence of campylobacters is very low in chicken slaughter batches in Finland. Data on other potential animal reservoirs of human pathogenic campylobacters in Finland are scarce. Consequently, this study aimed to investigate the status of Finnish cattle as a potential source of thermophilic Campylobacter spp. and antibiotic-resistant Campylobacter jejuni for human sporadic campylobacter infections of domestic origin. A survey of the prevalence of thermophilic Campylobacter spp. in Finnish cattle studied bovine rectal faecal samples (n=952) and carcass surface samples (n=948) from twelve Finnish slaughterhouses from January to December 2003. The total prevalence of Campylobacter spp. in faecal samples was 31.1%, and in carcass samples 3.5%. Campylobacter jejuni, the most common species, was present in 19.5% of faecal samples and in 3.1% of carcasses. In addition to thermophilic Campylobacter spp., C. hyointestinalis ssp. hyointestinalis was present in bovine samples. The prevalence of campylobacters was higher among beef cattle than among dairy cattle. Using the enrichment method, the number of positive faecal samples was 7.5 times higher than that obtained by direct plating. The predominant serotypes of faecal C. jejuni, determined by serotyping with a set of 25 commercial antisera for heat-stable antigens (Penner), were Pen2 and Pen4-complex, which covered 52% of the samples. Genotyping with pulsed-field gel electrophoresis (PFGE) using SmaI restriction yielded a high diversity of C. jejuni subtypes in cattle. Determining the minimum inhibitory concentrations of ampicillin, enrofloxacin, erythromycin, gentamicin, nalidixic acid, and oxytetracycline among bovine C. jejuni isolates using a commercial broth microdilution method yielded 9% of isolates resistant to at least one of the antimicrobials examined. No multiresistant isolates were found among the bovine C. jejuni strains. The study of the shedding patterns of Campylobacter spp. among three Finnish dairy cattle herds included the examination of fresh faecal samples and tank milk samples taken five times, as well as samples from drinking troughs taken once during the one-year study. The semiquantitative enrichment method detected C. jejuni in 169 of the 340 faecal samples, mostly at low levels. In addition, C. jejuni was present in one drinking trough sample. The prevalence between herds and sampling occasions varied widely. PFGE, using SmaI as restriction enzyme, identified only a few subtypes in each herd. In two 2 of the herds, two subtypes persisted throughout the sampling. Individual animals presented various shedding patterns during the study. Comparison of C. jejuni isolates from humans, chickens and cattle included the design of primers for four new genetic markers selected from completely sequenced C. jejuni genomes 81-176, RM1221 and NCTC 11168, and the PCR examination of domestic human isolates from southern Finland in 1996, 2002 and 2003 (n=309), chicken isolates from 2003, 2006 and 2007 (n=205), and bovine isolates from 2003 (n=131). The results revealed that bovine isolates differed significantly from human and chicken isolates. In particular, the - glutamyl transpeptidase gene was uncommon among bovine isolates. The PFGE genotyping of C. jejuni isolates, using SmaI and KpnI restriction enzymes, included a geographically representative collection of isolates from domestic sporadic human infections, chicken slaughter batches, and cattle faeces and carcasses during the seasonal peak of campylobacteriosis in the summer of 2003. The study determined that 55.4% of human isolates were indistinguishable from those of chickens and cattle. Temporal association between isolates from humans and chickens was possible in 31.4% of human infections. Approximately 19% of the human infections may have been associated with cattle. However, isolates from bovine carcasses and human cases represented different PFGE subtypes. In conclusion, this study suggests that Finnish cattle is a notable reservoir of C. jejuni, the most important Campylobacter sp. in human enteric infections. Although the concentration of these organisms in bovine faeces appeared to be low, excretion can be persistent. The genetic diversity and presence or absence of marker genes support previous suggestions of host-adapted C. jejuni strains, and may indicate variations in virulence between strains from different hosts. In addition to chickens, Finnish cattle appeared to be an important reservoir and possible source of C. jejuni in domestic sporadic human infections. However, sources of campylobacters may differ between rural and urban areas in Finland, and in general, the transmission of C. jejuni of bovine origin probably occurs via other routes than food.
  • Gadd, Tuija (Evira, 2013)
    Viral haemorrhagic septicaemia virus (VHSV) was diagnosed after clinical symptoms for the first time in 2000 from four rainbow trout Oncorhynchus mykiss (Walbaum) farms in Åland and Pyhtää in Finland. Phylogenetic analysis based on the full-length VHSV glycoprotein (G) and nonvirion (NV) genes of the Finnish VHSV isolates in 2000–2004 revealed that all isolates are closely related and grouped in the genotype Id, which suggests the same origin of infection. Finnish isolates were shown to be closely related to the old freshwater isolates from rainbow trout in Denmark and to one old marine isolate from cod in the Baltic Sea, and located close to the presumed ancestral source. Infection with the VHSV genotype Id has spread since then, and the same genotype had been isolated from rainbow trout farms in three separate locations: Åland in the Baltic Sea, and Uusikaupunki in the Gulf of Bothnia, and Pyhtää in the Gulf of Finland. The majority of isolations have been from Åland, and since 2009 have only been from there. The VHSV genotype Id was isolated from Pyhtää only in 2000 and 2001 and from Uusikaupunki once in 2004 and 2008. The pathogenicity of rainbow trout genotype Id isolates was analysed in infection experiments with rainbow trout fry. The cumulative mortalities induced by waterborne and intraperitoneal challenge were approximately from 13% to 40% and 66 % to 90%, respectively, depending on the size of the rainbow trout fingerlings. The Finnish brackish water VHSV genotype Id isolates induce lower mortality than freshwater VHSV isolates in infection experiments but they could represent an intermediate stage of marine isolates evolving towards pathogenicity in rainbow trout. The occurrence of viral haemorrhagic septicaemia virus (VHSV) was examined in the main spawning stocks of wild European river lamprey, Lampetra fluviatilis, in the rivers of Finland from 1999 to 2008. In total, 2621 lampreys as 262 pooled samples were examined virologically during 1999–2008. VHSV was isolated from five lamprey samples from the mouth of the rivers Lestijoki and Kalajoki, which flow into the Bothnian Bay of the Baltic Sea from Finland. The full-length VHSV G gene sequence revealed that the isolates were closely related to the VHSV strains isolated earlier from herring and sprat, Sprattus sprattus (L.), in Gotland and were therefore assigned to VHSV genotype II. The virulence of the lamprey VHSV genotype II isolate was evaluated by an experimental infection trial in rainbow trout fry. No mortality was induced post-infection by either waterborne or intraperitoneal challenge. To clarify the role of wild fish, especially Baltic herring, Clupea harengus membras (L.), in the epidemiology of VHSV in brackish waters, Baltic herring with no visible signs of disease were collected from the Archipelago Sea, the Gulf of Bothnia and from the Eastern Gulf of Finland. In total 7580 herring as 758 pooled 5 samples and 3 029 wild salmonid broodfish were virologically examined during 2004–2006. VHSV was isolated from 50 pooled herring samples collected from the Archipelago Sea and one pooled sample collected from the Gulf of Bothnia. Further studies based on the full-length VHSV G gene sequence revealed that the Finnish herring isolates were VHSV genotype II, closely related to the VHSV strains isolated earlier from herring and sprat in Gotland. VHSV genotype II isolated from the lamprey and herring is thought to be independent of the VHSV Id epidemic in farmed rainbow trout in Finnish brackish waters. The most varied VHSV strains are found in seawater. This would indicate that the viruses in freshwater originate from the sea. Two fish farms situated in the lake area of Finland have experienced elevated mortalities affecting fry of grayling, Thymallus thymallus, since 2002. These farms are using surface water for the production of juveniles of several fish species. Fourteen pooled samples were positive in virus isolation. Based on full-length G gene and partial RNA polymerase (L) gene sequences and the indirect fluorescent antibody technique (IFAT), the virus was classified as a perch rhabdovirus (PRV). Pairwise comparisons of the G and L gene regions of grayling isolates revealed that all the isolates were very closely related, with almost 100% nucleotide identity, which suggests the same origin of infection for the two farms. PRV isolates were closely related to the strain isolated from perch, Perca fluviatilis and sea trout, Salmo trutta trutta, caught from the Baltic Sea. The second shortest phylogenetic distances to rhabdoviruses isolated from other countries appeared to be to perch, grayling and pikeperch isolates from France and a pike rhabdovirus isolate from Denmark. This is the first time PRV has caused disease in grayling in Finland.
  • Hallikainen, Anja; Hirvonen, Tero; Liukkonen, Kirsi-Helena; Kartio, Mirja; Rautala, Taneli; Hietaniemi, Veli; Koivisto, Tauno; Rämö, Sari; Kronberg-Kippilä, Carina; Ovaskainen, Marja-Leena; Sinkko, Harri (Evira, 2008)
    Yleisiä suomalaisissa viljoissa esiintyviä homeiden tuottamia Fusarium-toksiineja ovat deoksinivalenoli, zearalenoni, nivalenoli sekä T-2- ja HT-2-toksiinit. Fusarium-toksiineja esiintyy erityisesti kaurassa. EU:ssa on asetettu enimmäispitoisuusrajat deoksinivalenolille ja zearalenonille. T-2- ja HT-2- toksiinien lainsäädäntö on EU:ssa työn alla. Pitkäaikainen altistuminen Fusarium-toksiineille voi aiheuttaa terveydellisiä haittavaikutuksia, kuten immuunijärjestelmän heikkenemistä. Kaikkia pitkäaikaisen altistumisen vaikutuksia ei kuitenkaan toistaiseksi tunneta. Akuuteissa myrkytystapauksissa oireita ovat esimerkiksi pahoinvointi, oksentelu ja vatsakivut. Suomalaisten altistuminen Fusarium-toksiineille arvioitiin Evirassa yhteistyössä Maa- ja elintarviketalouden tutkimuskeskuksen ja Kansanterveyslaitoksen kanssa. Saannit ovat alle siedettävän päivittäisen enimmäissaantimäärän lukuun ottamatta T-2- ja HT-2-toksiineja, joita kauran suurkuluttajat voivat teoriassa saada raakaviljasta liikaa. Toksiinipitoisuudet vaihtelevat vuosittain erityisesti satokauden sään perusteella. Lisäksi viljan lajittelulla ja kuorinnalla voidaan vähentää toksiinien määrää merkittävästi. Viljoille asetettuja Fusarium-toksiinien enimmäispitoisuuksia on syytä valvoa jatkuvasti. Valvonnan kohdentamista suositellaan erityisesti kauralle ja kauravalmisteille, joissa esiintyy suurimmat pitoisuudet toksiineja.
  • Bagcigil, F.; Taponen, S.; Koort, J.; Bengtsson, B.; Myllyniemi, A.-L.; Pyörälä, S. (2012)
    Background: The blaZ gene encoding penicillin resistance can be located either chromosomally or on plasmids. The aim of this study was to investigate the genetic relationships and to determine the location of the blaZ gene in S. aureus isolated in bovine mastitis in Finland and Sweden. Methods: Seventy-eight β-lactamase positive S. aureus isolates from bovine mastitis (34 from Finland and 44 from Sweden) were included in the study. The localization of blaZ gene was determined by Southern blotting. The blaZ genes of the isolates were sequenced and the sequences were translated to beta-lactamase proteins and further grouped as different protein signatures. The isolates and, as control, 33 Swedish and 36 Finnish beta-lactamase negative isolates were typed with pulsed-field gel electrophoresis (PFGE). Results: In 26 out of 34 Finnish isolates (76.5%) and in 25 out of 44 Swedish isolates (56.8%) the blaZ gene was localized on a plasmid. Six different protein signatures were found. One signature was found only in four Swedish isolates, but all other signatures were found both in Finnish and Swedish isolates. The PFGE results revealed a diversity of S. aureus clones. The protein signatures were not clearly associated with certain pulsotypes. Conclusions: The plasmid location of the blaZ gene was not statistically significantly more common in Finland than in Sweden, and hence does not explain the higher proportion of penicillin-resistant isolates of S. aureus causing bovine mastitis in Finland compared to Sweden.
  • Metlin, Artem (Evira, 2008)
    Rabies is a fatal disease that affects the central nervous system of all warmblooded mammals. The rabies virus belongs to the order Mononegavirales, family Rhabdoviridae, genus Lyssavirus. This virus has a negative single-stranded RNA genome and the virions are bullet-shaped. Rabies is reported in many countries throughout the world and has been registered in all continents except Australia, where only the bat Lyssaviruses have been found, and in Antarctica where the main vectors of rabies are absent. Russia and most of the bordering countries are affected by rabies. Finland was a rabies-free country from 1959 to 1988, when a sylvatic rabies epidemic appeared with raccoon dogs as the main host and vector of infection. That epidemic was eradicated by the oral vaccination of wild carnivores and the parenteral immunization of dogs and cats; and Finland has been rabies-free since 1991. However, this status is constantly under threat because rabies is endemic in Russia and Estonia. In June 2003, a horse imported to Finland from Estonia was clinically and laboratory diagnosed as rabies positive. The close relationship of the isolated equine virus strain with the current Estonian strains was verified during subsequent molecular epidemiological studies. Because the case was imported, it did not affect Finland’s rabies-free status. Also in 2007 another 2 imported cases of rabies were recorded: one in a human being from Philippines and the other in a dog from India. Five different antigenic variants of the rabies virus were identified among rabies positive field samples from Russia, Finland, and Estonia by using antinucleocapsid monoclonal antibodies. Two rabies virus field isolates showed a different reaction pattern that was similar to that of the vaccine strains of the SAD group, which might suggest a new antigen variant or reverted vaccine strain. Nevertheless, the sequence analysis showed that the vaccine strains RV-97 and SAD B19 included in the oral anti-rabies vaccine “Sinrab” (Russia) and “Fuchsoral” (Germany), respectively, differ considerably from all the field strains. Field rabies viruses collected in recent years from different regions of the Russian Federation were chosen on the basis of mAb studies and geographical origin for molecular epidemiological studies to characterize their genetic heterogeneity and to study their molecular epidemiology. In addition to the Russian viruses, archival samples from Estonia and Finland and Russian vaccine strains were also included in this study. Among the field viruses studied, two main phylogenetic groups were found, and designated as the Pan-Eurasian and Caucasian based on their geographical origin. The Pan-Eurasian 7 group including some reference viruses from Europe was further divided into four subgroups. All the vaccine strains were clearly different from the field strains. No recombination between the field and vaccine virus strains was observed. The critical roles of geographical isolation, the limitation of the genetic clustering, and the evolution of the rabies virus were shown during this study. The rabies virus vaccine strain RV-97 is widely used in Russia as a component of the oral anti-rabies vaccine “Sinrab”. To characterize the molecular properties of this strain, entire genome sequencing was conducted. A simple technique was developed to obtain this sequence, including the 3’- and 5’- ends. The entire genome sequence and deduced amino-acid sequences of the major viral proteins were compared with the sequences of other known fixed rabies viruses. The strain RV-97 formed a separate phylogenetic branch and seems to be more related to the group of Japanese strains. The field strains from the Caucasian group seem to be phylogenetically the nearest group to the RV-97 strain. The data shown herein makes it possible to develop molecular methods for distinguishing between the field rabies viruses from the vaccine strains for the rapid recognition of the vaccine strains that are unstable or have reverted back to their pathogenic form. The wide genetic heterogeneity verified in this study indicates that it is important to remain on permanent alert for the appearance of rabies.
  • Metlin, Artem (Evira, 2008)
    Rabies is a fatal disease that affects the central nervous system of all warmblooded mammals. The rabies virus belongs to the order Mononegavirales, family Rhabdoviridae, genus Lyssavirus. This virus has a negative single-stranded RNA genome and the virions are bullet-shaped. Rabies is reported in many countries throughout the world and has been registered in all continents except Australia, where only the bat Lyssaviruses have been found, and in Antarctica where the main vectors of rabies are absent. Russia and most of the bordering countries are affected by rabies. Finland was a rabies-free country from 1959 to 1988, when a sylvatic rabies epidemic appeared with raccoon dogs as the main host and vector of infection. That epidemic was eradicated by the oral vaccination of wild carnivores and the parenteral immunization of dogs and cats; and Finland has been rabies-free since 1991. However, this status is constantly under threat because rabies is endemic in Russia and Estonia. In June 2003, a horse imported to Finland from Estonia was clinically and laboratory diagnosed as rabies positive. The close relationship of the isolated equine virus strain with the current Estonian strains was verified during subsequent molecular epidemiological studies. Because the case was imported, it did not affect Finland’s rabies-free status. Also in 2007 another 2 imported cases of rabies were recorded: one in a human being from Philippines and the other in a dog from India. Five different antigenic variants of the rabies virus were identified among rabies positive field samples from Russia, Finland, and Estonia by using antinucleocapsid monoclonal antibodies. Two rabies virus field isolates showed a different reaction pattern that was similar to that of the vaccine strains of the SAD group, which might suggest a new antigen variant or reverted vaccine strain. Nevertheless, the sequence analysis showed that the vaccine strains RV-97 and SAD B19 included in the oral anti-rabies vaccine “Sinrab” (Russia) and “Fuchsoral” (Germany), respectively, differ considerably from all the field strains. Field rabies viruses collected in recent years from different regions of the Russian Federation were chosen on the basis of mAb studies and geographical origin for molecular epidemiological studies to characterize their genetic heterogeneity and to study their molecular epidemiology. In addition to the Russian viruses, archival samples from Estonia and Finland and Russian vaccine strains were also included in this study. Among the field viruses studied, two main phylogenetic groups were found, and designated as the Pan-Eurasian and Caucasian based on their geographical origin. The Pan-Eurasian group including some reference viruses from Europe was further divided into four subgroups. All the vaccine strains were clearly different from the field strains. No recombination between the field and vaccine virus strains was observed. The critical roles of geographical isolation, the limitation of the genetic clustering, and the evolution of the rabies virus were shown during this study. The rabies virus vaccine strain RV-97 is widely used in Russia as a component of the oral anti-rabies vaccine “Sinrab”. To characterize the molecular properties of this strain, entire genome sequencing was conducted. A simple technique was developed to obtain this sequence, including the 3’- and 5’- ends. The entire genome sequence and deduced amino-acid sequences of the major viral proteins were compared with the sequences of other known fixed rabies viruses. The strain RV-97 formed a separate phylogenetic branch and seems to be more related to the group of Japanese strains. The field strains from the Caucasian group seem to be phylogenetically the nearest group to the RV-97 strain. The data shown herein makes it possible to develop molecular methods for distinguishing between the field rabies viruses from the vaccine strains for the rapid recognition of the vaccine strains that are unstable or have reverted back to their pathogenic form. The wide genetic heterogeneity verified in this study indicates that it is important to remain on permanent alert for the appearance of rabies.
  • Lindqvist, Nanna; Pelkonen, Sinikka (BioMed Central, 2007)
    Background: Salmonella serovar Infantis is endemic in Finnish food-producing animals since the 1970s. The purpose of this study was to describe the molecular epidemiology of the infection in cattle during 1985–2005, to follow the persistence of the feed-related outbreak strain from 1995 in the cattle population, and to analyse the stability of XbaI-banding patterns in individual herds during long-lasting infections. Methods: Salmonella Infantis isolates from 478 cattle herds (n = 588), covering 73% of the subclinically or clinically infected herds, were typed by pulsed-field gel electrophoresis (PFGE) using XbaI. DNA fragments larger than 125 kb were counted in PFGE types because of high plasmid background. Ribotyping and IS200-typing with BanI-digested DNA were done on 57 selected isolates. Results: The isolates associated with the infection consisted of 51 PFGE types with genetic similarity (F value) between 0.58 and 0.95. From 1985 to 2003, the major type appeared on 68% of the farms. The three most common types, with F values of 0.90 to 0.95, accounted for 80% of the isolates. Only 17% of the isolates had F values below 0.80, and 1% below 0.70. Ribotyping and IS200-typing classified 89% of the analysed isolates into the major ribotype and IS200 type combination, and the rest fell into closely related types. Analysis of successive isolates from 142 herds revealed changes in XbaI-banding patterns in 21% of the herds with two analysed isolates and in 38% of the herds from which three or more isolates were analysed. The feed-related S. Infantis genotype from the 1995 outbreak had disappeared by 1999, at the time when the incidence of bovine salmonella, and S. Infantis in particular, strongly decreased. Conclusion: The study showed how genetic surveillance, as part of salmonella control, provides tools to follow the persistence of particular infections, and to assess the efficacy of control measures. Testing of several isolates from a herd in outbreak investigations is advisable, because minor changes in PFGE banding patterns frequently occur during long-lasting infections.
  • Lavikainen, Tiina; Karlström, Ulla; Bäckman, Christina; Hirvonen, Tero (Evira, 2007)
    Maksa on monipuolinen ruoka-aine, mutta maksansyönnin turvallisuus raskauden aikana on askarruttanut pitkään niin kuluttajia kuin terveydenhuoltoakin. Maksa sisältää runsaasti retinoidimuotoista A-vitamiinia, joka suurina annoksina voi lisätä sikiövaurioiden ja keskenmenon riskiä. Lisäksi maksa voi sisältää runsaasti kadmiumia ja lyijyä, joilla voi olla haitallinen vaikutus sikiöön. Tämän vuoksi odottaville äideille suositellaan, että maksan syöntiä vältetään koko raskauden ajan. Maksaruokien käytön todellisista riskeistä raskauden aikana ei ole ollut tutkittua tietoa, ja syöntirajoituksen tarpeellisuudesta keskustellaan toistuvasti. Tämän vuoksi Elintarviketurvallisuusvirasto Evirassa on tehty riskinarviointi hedelmällisessä iässä olevien suomalaisnaisten altistumisesta retinoideille maksaruokien välityksellä. Arvioinnissa tarkasteltiin riskiä suositukset ylittävälle retinoidien saannille, mikäli maksaruuat, tai vain jotkin niistä, säilyisivät osana raskauden ajan ruokavaliota. Työssä arvioitiin myös muiden kuin syöntirajoituksiin perustuvien toimenpiteiden vaikutusta retinoidien saantiin. Lisäksi arvioitiin maksaruokien kautta tapahtuvaa kadmium- ja lyijyaltistusta. Arvioinnin pohjana käytettiin maksaruokien kulutustietoja (Finravinto 2002 -tutkimus, KTL), maksaruokien reseptitietoja sekä tuoreita tietoja maksojen retinoidi-, kadmium- ja lyijypitoisuuksista. Arvioinnin välineeksi rakennettiin altistusta kuvaava matemaattinen simulaatiomalli. Altistusta arvioitiin pitkäaikaissaantina (keskimääräinen päivittäinen saanti), ja retinoidien osalta myös altistuksena kerta-annoksesta. Mallin tuloksia verrattiin olemassa oleviin saantisuosituksiin ja saannin ylärajoihin. Riskinarvioinnissa päädyttiin seuraaviin johtopäätöksiin: 1. Maksaruokien käyttö voi altistaa suuremmille retinoidiannoksille kuin mitä pidetään turvallisena raskauden aikana. Liikasaannin riski näyttäisi kuitenkin koskevan lähinnä pääruokana syötäviä maksaruokia, kuten maksalaatikkoa, jauhemaksapihviä ja maksakastiketta. Kohtuullinen maksamakkaran tai maksapasteijan syönti raskauden aikana ei näyttäisi altistavan sellaisille retinoidiannoksille, joiden voidaan katsoa lisäävän sikiövaurioiden riskiä. 2. Tehokkain keino retinoidien liikasaannin riskin vähentämiseksi on välttää etenkin pääruokina käytettyjen maksaruokien syöntiä raskauden aikana. Muiden tarkasteltujen skenaarioiden vaikuttavuus oli selvästi heikompi. Emakonmaksan elintarvikekäytön lopettamisella olisi vain vähäinen vaikutus retinoidien saantiin. Vastaavasti maksojen retinoidipitoisuuksien pitäisi vähentyä noin neljännekseen, jotta vaikutus vastaisi osittaisen syöntirajoituksen (ei pääruokana syötäviä maksaruokia) tehokkuutta. 3. Kun A-vitamiinin saantia tarkastellaan ravitsemuksellisesta näkökulmasta, maksansyönti auttaa saantisuositusten täyttymisessä. Maksa sisältää A-vitamiinin lisäksi myös monia muita tärkeitä hivenaineita ja vitamiineja, kuten foolihappoa ja rautaa. Maksansyönnillä saavutettavat ravitsemukselliset hyödyt voitaneen kuitenkin korvata runsaasti kasviksia ja kohtuullisesti lihaa sisältävällä monipuolisella ruokavaliolla, jolloin retinoidien liikasaannin riskiä ei ole. 4. Maksaa syövillä naisilla kadmiumin ja lyijyn saanti maksaruokien välityksellä on melko vähäistä verrattuna altistukseen muista ravintolähteistä. Maksan sisältämä rauta saattaa vähentää kadmiumin ja lyijyn imeytymistä maksaruuista.
  • Hallikainen, Anja; Airaksinen, Riikka; Rantakokko, Panu; Koponen, Jani; Mannio, Jaakko; Vuorinen, Pekka J.; Jääskeläinen, Timo; Kiviranta, Hannu (Evira, 2011)
    EU-KALAT II hankkeessa tuotettiin tietoa Itämeren kalojen ja kotimaisten järvikalojen sekä kasvatettujen kalojen PCDD/F- ja PCB- sekä PBDE-pitoisuuksista eri ikäisissä ja kokoisissa kaloissa sekä lajeittain että alueittain. Hankkeessa tutkittiin myös perfluorattuja yhdisteitä (PFC) ja organotina (OT)-yhdisteitä sekä lihaksesta että maksasta. Tutkimuksesta saatiin uutta tietoa kalojen haitallisten aineiden pitoisuuksista riskinhallintaa varten. Vuoden 2009 tuloksia verrattiin aikaisempiin tuloksiin vuosilta 2002-2003. Itämeren ja muun kotimaisen kalan PCDD/F- ja PCB-pitoisuuksista nousevat esiin samat kalalajit, joiden on aiemminkin todettu keräävän näitä ympäristömyrkkyjä. Silakka, lohi ja meritaimen sekä nahkiainen ja tässä hankkeessa lisäksi kampela Kotkan alueelta ylittävät PCDD/F- ja PCB-yhdisteille asetetut enimmäispitoisuusrajat. Itämeren kaloista, kilohailin, muikun, ahvenen, hauen, kuhan, mateen ja turskan dioksiinien mediaanipitoisuudet eivät yllä edes puoleen sallitusta enimmäispitoisuudesta, joka on 4 pg/g tuorepainoa. Kun verrataan vuoden 2002-2003 pitoisuuksia vuoden 2009 PCDD/F- ja PCB- sekä PBDE-yhdisteiden pitoisuuksiin, ovat lohen ja silakan keskimääräiset pitoisuudet pienentyneet. Avomerialueiden OT-pitoisuudet lihaksessa olivat noin kolmanneksen pienemmät kuin vuonna 2005–2007 pyydetyissä näytteissä. Pahimpia Itämeren ympäristömyrkkyjä ovat edelleen dioksiinit ja dioksiininkaltaiset PCB-yhdisteet. PBDE- ja PFOS- ja OTpitoisuudet ovat pieniä muutamaa poikkeusta lukuun ottamatta. Useista kalalajeista suurimmat haitta-aineiden pitoisuudet todettiin seuraavilta alueilta: Selkämereltä Porin edusta ja Turun ja Kotkan pyyntialueet sekä kaikkein pahimpana Helsingin Vanhankaupunginlahti, jossa sekä OT- että PFOS-pitoisuudet antavat aihetta suositella kulutuksen rajoittamista, ainakin isojen ahventen osalta.
  • Lyytikäinen, Tapani; Vehmas, Tuija; Vennerström, Pia (Evira, 2007)
    Kalojen VHS-tauti on vain kalojen välillä leviävä tauti, joka vaikeuttaa kalanviljelyä Suomessa. Tauti aiheuttaa suurta kuolleisuutta erityisesti kirjolohilla mutta tauti voi tarttua myös lukuisiin muihin kalalajeihin. Suomessa VHS-tautia löydettiin ensin 2000-luvun alussa ahvenanmaalaisilta kalanviljelylaitoksilta sekä Pyhtäältä ja myöhemmin Uudenkaupungin-Rauman-Pyhärannan alueelta. Tällä tutkimuksella selvitettiin ja kuvattiin kalanviljelyyn liittyviä toiminnallisia yhteyksiä vuonna 2005, joiden voisi odottaa edistävän VHS-taudin sisämaahan leviämistä. Lisäksi arvioitiin vaikutuksia, joita voisi olla taudin leviämisestä sisämaahan. Tarkastelun kohteina olivat erityisesti Ahvenanmaan ja Lounais-Suomen merialueen toiminnalliset yhteydet sisämaan kalanviljelyn ja kalanviljelyyn liittyvän toiminnan kanssa. Ahvenanmaa on VHS-rajoitusalue kun taas Lounais-Suomen merialue on pääasiassa vapaa VHS-taudista. Ahvenanmaan ja maantieteellisesti laajemman Lounais-Suomen merialueen toiminta on rakenteeltaan erilaista. Lounais-Suomessa yksiköt ovat pienempiä, perkaustoimintaa harjoittaa useampi yritys, perkaus- ja fileointijätteen käsittely on monimuotoisempaa kuin Ahvenanmaan rajoitusalueella. Ahvenanmaalla kasvatettua kalaa perataan ympäri vuoden kuin taas Lounais-Suomen merialueella perkaaminen on ajallisesti eriytyneempää. Ahvenanmaalta yhteyksiä sisämaahan muodostuu vain välillisesti: silloin kun sisämaan kasvatuslaitoksista tuodaan poikasia Ahvenanmaalle kasvatettavaksi. Sisämaasta tarkasteltaville alueille poikasia toimittaa ruokakalankasvatukseen noin 20 kalanviljelylaitosta. Auton kontaminoituminen VHS-viruksella kaloja purettaessa vaikuttaa epätodennäköiseltä. Koska kuljetuksia on määrällisesti vähän (alle 100 kappaletta vuodessa), kuljetusautot käyvät desinfioinnissa jokaisen kuljetetun erän jälkeen ja sisämaan laitoksissa harjoitetaan lisäksi taudinsuojaustoimia, taudin leviäminen tätä kautta ei vaikuta kovin todennäköiseltä. Ahvenanmaalta on mannersuomeen myös muunlaisia yhteyksiä: sieltä kuljetetaan perkaus -ja fileointijätteitä turkistarhauksessa käytettyjen rehujen raaka-aineeksi, sekä perattua kalaa kulutukseen ja jatkojalostukseen. Nämä yhteydet eivät kuitenkaan kohdistu sisävesistöjen kalankasvatusalueille vaan Pohjanmaalle, Lounais- ja Etelä-Suomeen. Perkaamattoman ja elävän kalan kuljettaminen pois Ahvenanmaalta taas on vastaavasti kielletty. Peratun kalan, fileointi- ja perkausjätteen kuljetukset kulkevat samoja reittejä kuin poikasten kuljetukset Ahvenanmaalle. Poikaskuljetusautojen ja reitin varrella olevien muutamien kalankasvatuslaitosten epäsuora kontaminoituminen tätä kautta vaikuttaa myös epätodennäköiseltä. Jos tauti kuitenkin pääsisi huomaamatta Lounais-Suomeen, taudin päätyminen sisävesistöihin olisi todennäköisempää, koska Lounais-Suomi ei ole rajoitusaluetta ja alueen kalankasvatuksessa voidaan toimia vapaammin. Jos tauti leviäisi sisämaahan, se voisi pahimmillaan jo yksittäisessä tautitapauksessa vaikuttaa kalaistutuksiin. Samat laitokset, jotka toimittavat poikaisia Ahvenanmaalle ja Lounais-Suomeen, kasvattavat myös muita kalalajeja istutustarkoituksiin. Erityisen haavoittuvia voisivat olla erilaisten taimenkantojen istutukset: jopa kolmannes istutuksista voisi estyä yksittäisestä sisävesistöjen VHS-tautitapauksesta. Ahvenanmaalle ja Lounais-Suomeen poikasia toimittavat laitokset ovat pääasiassa erillään muista kalanviljelylaitoksista eikä yksittäisen tautilöydöksen rajoitusalueelle kuitenkaan joutuisi juuri muita kalanviljelylaitoksia. Välillisesti vaikutukset voisivat olla merkittäviä, koska poikasten vienti ulkomaille saattaisi estyä.
  • Suomi, Johanna; Ranta, Jukka; Tuominen, Pirkko; Hallikainen, Anja; Putkonen, Tiina; Bäckman, Christina; Ovaskainen, Marja-Leena; Virtanen, Suvi; Savela, Kirsti (Evira, 2013)
    Nitraattia esiintyy luonnostaan monissa kasviksissa ja talousvedessä. Osa syödystä nitraatista muuttuu elimistössä nitriitiksi. Nitraattia ja nitriittiä käytetään myös elintarvikelisäaineina, koska ne hillitsevät haitallisten mikrobien kasvua. Toisaalta niiden suuren saannin katsotaan aiheuttavan terveyshaittoja. Esitetty probabilistinen riskinarviointi perustuu vuosina 2004 – 2012 tutkittuihin valvonta- ja tutkimusprojektinäytteisiin sekä kirjallisuustietoihin. Lisäksi käytettiin Terveyden ja hyvinvoinnin laitokselta saatuja Finravinto 2007- ja DIPP-ravintotutkimuksen tuottamia aikuisten ja lasten ruoankulutustietoja. Nitraattialtistus lisäainelähteistä on vähäistä. Valtaosa nitraattialtistuksesta saadaan luontaisista lähteistä: vihanneksista, hedelmistä ja vedestä. Kasvisten käsittely ja hyvä viljelykäytäntö vähentävät saantia. Paljon nitraattia sisältävien kasvisten suurkuluttajien altistus voi ylittää nitraatin hyväksyttävän päivittäissaannin (ADI). Nitriittialtistus elintarvikkeista ja talousvedestä voi ylittää ADI-arvon noin 14 %:lla 3-vuotiaista ja 11 %:lla 6-vuotiaista suomalaislapsista. Suurin altistuslähde ovat ruokamakkarat. Toisaalta jos nitriittipitoisuuksia alennettaisiin nykytasosta, hygieniavaatimuksia ja kylmäketjuhallintaa olisi tehostettava.