Detection of rainbow trout antibodies against viral haemorrhagic septicaemia virus (VHSV) by neutralisation test is highly dependent on the virus isolate used

J.M. Fregeneda-Grandes, Niels Jørgen Olesen

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    Three serological tests, enzyme linked immunosorbent assay (ELISA), 50 % plaque neutralisation test (50%PNT) and Western blotting (WB), were used to detect antibodies against viral haemorrhagic septicaerma virus (VHSV) in 50 rainbow trout broodstock from a rainbow trout farm endemically infected with VHS but with no clinical signs of infection. When the sera were examined by 50%PNT using the VHSV reference isolate DK-F1 or the heat attenuated DK-F25 mutant strain, no neutralizing antibodies were found. In contrast, when one of the virus isolates from the farm (homologous virus) was used in the 50 %PNT, 90 % of the fish were found to be positive. By examining a panel of different VHSV isolates in 50 %PNT, it was demonstrated that the virus isolate used as test antigen could significantly affect the sensitivity and titre determination in 50 %PNT for detection of rainbow trout antibodies against VHSV. When the sera were examined for the presence of VHSV antibodies by ELISA or WB, 61 % were found to be positive. When conducting WB analysis, the viral glycoprotein was the protein most frequently recognized, followed by the viral nucleoprotein.
    Original languageEnglish
    JournalDiseases of Aquatic Organisms
    Volume74
    Issue number2
    Pages (from-to)151-158
    ISSN0177-5103
    DOIs
    Publication statusPublished - 2007

    Keywords

    • VHSV
    • ELISA
    • trout antibody
    • serology
    • plaque neutralisation

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