Journal
JOURNAL OF FISH DISEASES
Volume 27, Issue 3, Pages 143-149Publisher
WILEY
DOI: 10.1111/j.1365-2761.2004.00530.x
Keywords
alphavirus; salmon pancreas disease; salmon pancreas disease virus; sleeping disease; sleeping disease virus; viraemia
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A simple method of detecting the presence of the salmonid alphaviruses (SAVs), salmon pancreas disease virus (SPDV) and sleeping disease virus (SDV), from serum samples is described. Using a 96-well tissue-culture plate format, test sera are diluted in medium and added to chinook salmon embryo (CHSE-214) cells. After incubation for 3 days at 15 degreesC, plates are fixed and stained using a monoclonal antibody (mAb)-based immunoperoxidase (IPX) detection system, and virus-infected cells are observed microscopically by white light. Application of this screening test, which is now used routinely in our laboratory in conjunction with an IPX-based virus neutralization (IPX-VN) test for detecting antibodies to SAVs, has resulted in the recovery of 12 additional isolates from salmon sera and four additional isolates from trout sera. A low level of antigenic variation was detected when these SAV isolates were investigated by indirect immunofluorescence using a panel of mAbs raised to reference SPDV and SDV isolates.
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