Koi herpesvirus and carp oedema virus: Infections and coinfections during mortality events of wild common carp in the United States

Soumesh K. Padhi, Isaiah Tolo, Margaret McEachran, Alexander Primus, Sunil K. Mor, Nicholas B.D. Phelps

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Koi herpesvirus (KHV; cyprinid herpesvirus-3) and carp oedema virus (CEV) are important viruses of common and koi carp (Cyprinus carpio); however, the distribution of these viruses in wild common carp in North America is largely unknown. During the summers of 2017 and 2018, 27 mass mortalities of common carp were reported from four states in the USA (Minnesota, Iowa, Pennsylvania and Wisconsin), the majority of which were distributed across eight major watersheds in southern Minnesota. Samples from 22 of these mortality events and from five clinically healthy nearby carp populations were screened for KHV, CEV and SVCV using real-time polymerase chain reaction (qPCR). KHV was confirmed in 13 mortality events, CEV in two mortality events and coinfections of KHV/CEV in four mortality events. Nucleotide sequence analysis revealed that the KHV and CEV detected here are closely related to European lineages of these viruses. While molecular detection alone cannot conclusively link either virus with disease, the cases described here expand the known range of two important viruses. This is also the first reported detection of KHV and CEV coinfections in wild carp populations.

Original languageEnglish (US)
Pages (from-to)1609-1621
Number of pages13
JournalJournal of Fish Diseases
Volume42
Issue number11
DOIs
StatePublished - Nov 1 2019

Bibliographical note

Funding Information:
This project would not have been possible without the dedicated efforts of those who collected carp for this study, including the Minnesota Department of Natural Resources pathology laboratory and field biologists, Carp Solutions LLC, Wisconsin Department of Natural Resources, Pennsylvania Fish and Boat Commission and the Bajer Lab at the University of Minnesota Aquatic Invasive Species Research Center. Funding for this project was provided by the Environment and Natural Resources Trust Fund as recommended by the Minnesota Aquatic Invasive Species Research Center.

Funding Information:
This project would not have been possible without the dedicated efforts of those who collected carp for this study, including the Minnesota Department of Natural Resources pathology laboratory and field biologists, Carp Solutions LLC, Wisconsin Department of Natural Resources, Pennsylvania Fish and Boat Commission and the Bajer Lab at the University of Minnesota Aquatic Invasive Species Research Center. Funding for this project was provided by the Environment and Natural Resources Trust Fund as recommended by the Minnesota Aquatic Invasive Species Research Center.

Publisher Copyright:
© 2019 John Wiley & Sons Ltd

Keywords

  • carp oedema virus
  • coinfection
  • emerging disease
  • koi herpesvirus

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