Abstract
MARC-145 cell monolayers infected with PRRS virus were fixed in 3% neutral buffered formalin and embedded in paraffin. The sections were stained by avidin-biotin complex immunoperoxidase (ABC) method. Test sera were applied to sections as primary antibodies. The positive reactions were detected by ABC method and indirect immunofluorescent assay (IFA). There was good correlation between ABC and IFA, and the titers in ABC were higher than those in IFA. The present results indicate that the immunohistochemical staining is a useful test for the detection and quantitation of PRRS virus antibody in swine sera as well as IFA.
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