Surveillance of CEV in the Czech Republic

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00027162%3A_____%2F21%3AN0000079" target="_blank" >RIV/00027162:_____/21:N0000079 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

Surveillance of CEV in the Czech Republic

Original language description

Common carp (Cyprinus carpio) is the most important farmed fish in the Czech Republic, with a stable yearly production of around 20 000 tones, representing around 85 % of Czech aquaculture. Thousands of interconnected shallow ponds of varying sizes supply both local and international markets, especially in the Christmas season. Additionally, an increasing number of both professional and hobby breeders work with the ornamental koi carp reared in various conditions, from indoor tanks to garden ponds. While the presence of koi herpesvirus (Cyprinid herpesvirus-3, KHV) in the country is established since at least 2009 in the form of several outbreak sites per year, in the last few years, attention is also given to carp edema virus (CEV). Although this poxvirus and its ability to infect both koi and common carp were already described in the 1970's in Japan, its presence in European aquaculture has been of concern only since about the year 2014. Our laboratory obtained the primers for CEV detection in the year 2015 thanks to our colleagues in CEFAS and the surveillance of the virus started in the same year. Initially, fresh and archived samples from KHV-negative mortality events with typical necrotic gill lesions in carp were examined, with three, one and two sites showing the presence of CEV in the samples from the years 2013, 2014 and 2015, respectively. After research funding for this topic was secured in 2017, larger scale surveillance followed, with the help of the Czech State Veterinary Administration. From 2017 to 2020, nearly 350 locations were examined along with the mandatory KHV surveillance, with 39 ponds tested positive for the presence of CEV. All of the positive samples were either from common carp farms or from koi breeders. Although samples from several different species including sander, sturgeon, burbot, chub, grass carp, crucian carp and crucian x common carp hybrids were also examined, none of the animals tested positive for the presence of CEV. Phylogenetic analysis of the partial P4a protein gene of the obtained virus isolates confirmed the presence of all three proposed CEV genogroups in the Czech Republic: I and IIa in both koi and common carp and IIb only in koi, mostly recently imported from Asia.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10607 - Virology

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů