Presence of viral haemorrhagic septicaemia virus (VHSV) in the environment of virus-contaminated fish farms and processing plants

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Vennerström , P , Maunula , L , Välimäki , E & Virtala , A-M 2020 , ' Presence of viral haemorrhagic septicaemia virus (VHSV) in the environment of virus-contaminated fish farms and processing plants ' , Diseases of Aquatic Organisms , vol. 138 , pp. 145-154 . https://doi.org/10.3354/dao03454

Title: Presence of viral haemorrhagic septicaemia virus (VHSV) in the environment of virus-contaminated fish farms and processing plants
Author: Vennerström, Pia; Maunula, Leena; Välimäki, Elina; Virtala, Anna-Maija
Contributor: University of Helsinki, Food Hygiene and Environmental Health
University of Helsinki, Veterinary Biosciences
Date: 2020
Language: eng
Number of pages: 10
Belongs to series: Diseases of Aquatic Organisms
ISSN: 0177-5103
URI: http://hdl.handle.net/10138/315710
Abstract: After the first outbreak of viral haemorrhagic septicaemia virus (VHSV) in Finnish brackish water rainbow trout Oncorhynchus mykiss farms, infection spread rapidly between the farms. The infrastructure of fish farming did not take into account spreading of infectious fish diseases. To show the presence of VHSV in the environment, we tested seawater, sediment and wild blue mussels Mytilus edulis from VHSV-infected fish farms, and liquid waste from a processing plant that handled infected rainbow trout. Additionally, blue mussels were bath-challenged with VHSV (exposed to cultivated virus or naturally infected rainbow trout). To detect VHSV, virus isolation in cell culture and real-time reverse transcriptase polymerase chain reaction (qRT-PCR) were used. The virus or viral RNA was detected in sea water and in liquid waste from processing plants during wintertime when water temperature is close to 0 degrees C and sunlight is sparse. VHSV did not appear to replicate in blue mussels in our study. Therefore, blue mussels were not considered relevant carriers of VHSV. However, traces of viral RNA were detected up to 29 d post challenge in mussels. Contact with water from processing plants handling VHSV-infected fish populations increases the risk of the disease spreading to susceptible fish populations, especially during cold and dark times of the year.
Subject: Viral haemorrhagic septicaemia virus
Environment
Sea water
Liquid waste
Blue mussels
Processing plant
UV-light
PANCREATIC NECROSIS VIRUS
SALMON-ANEMIA-VIRUS
RAINBOW-TROUT
BLUE MUSSEL
WATER
RISK
PERSISTENCE
DEPURATION
STABILITY
EVOLUTION
11832 Microbiology and virology
413 Veterinary science
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