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Serological techniques for detection of lymphocystis virus in fish

Published online by Cambridge University Press:  15 June 2002

Esther García-Rosado
Affiliation:
Department of Microbiology, Faculty of Sciences, University of Malaga, Campus Universitario Teatinos, 29071 Malaga, Spain
Dolores Castro
Affiliation:
Department of Microbiology, Faculty of Sciences, University of Malaga, Campus Universitario Teatinos, 29071 Malaga, Spain
Irene Cano
Affiliation:
Department of Microbiology, Faculty of Sciences, University of Malaga, Campus Universitario Teatinos, 29071 Malaga, Spain
Sara I. Pérez-Prieto
Affiliation:
Centro de Investigaciones Biológicas, CSIC, 28071 Madrid, Spain
Juan J. Borrego
Affiliation:
Department of Microbiology, Faculty of Sciences, University of Malaga, Campus Universitario Teatinos, 29071 Malaga, Spain
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Abstract

Three serological techniques (indirect immunofluorescence test, flow cytometry, and indirect dot–blot immunoenzymatic assay) have been evaluated for the detection of lymphocystis viral antigens using a gilt-head seabream cell line, SAF-1, and fish leukocytes. Six lymphocystis disease virus (LCDV) isolates from gilt-head seabream, and one reference strain (ATCC VR 342), were tested. Detection of viral LCDV antigens in SAF-1 cells and fish leukocytes by indirect immunofluorescence test occurs at similar periods (5–7 d post-inoculation), and viral antigens were detected as cytoplasmic inclusions located at the periphery of inoculated cells. The percentages of cells with LCDV antigens obtained by flow cytometry were very low, ranging between 0.9% at 5 d post-inoculation and 19.7% at 10 d post-inoculation. The optimal concentration of viral stocks detected by indirect dot–blot immunoenzymatic assay was 0.5 μg ml–1, when purified viral stocks were used as antigens. Inoculated and uninoculated SAF-1 cells could not be distinguished using LCDV antiserum binding. On the basis of these results, indirect immunofluorescence and flow cytometry tests appear to be the best serological methods to detect LCDV antigens in both SAF-1 cells and fish leukocytes.

Type
Research Article
Copyright
© Elsevier, 2002

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