Abstract
The hemagglutinin subtype specificities of six monoclonal antibodies (MAbs) to influenza type A viruses were evaluated in a rapid culture assay by immunoperoxidase staining. Confluent monolayers of MDCK cells in multiwell plates were inoculated with (i) 23 reference viruses, (ii) 200 isolates collected during the influenza season 1995 to 1996, and (iii) 28 clinical specimens previously found to be influenza virus positive. After overnight incubation, the cells were fixed and stained with MAbs IVA1/B10, IIF4/D3, 12L/5, 13L/6, 18L/1, or 18L/4. Type-specific MAbs were included as controls. All antibodies gave intensive cytoplasmic staining with infected cells in the absence of any reaction with uninfected cells. MAbs 12L/5, 13L/6, 18L/1, and 18L/4 exclusively reacted with viruses of the subtype H1, and the antibodies IVA1/B10 and IIF4/D3 exclusively reacted with viruses of the subtype H3. None of these MAbs reacted with viruses of the H2 subtype or with influenza type B viruses. Of the 200 recent isolates, 63 were identified as influenza virus type A, subtype H1, 95 were identified as type A, subtype H3, and 41 were identified as type B. One isolate contained a mixture of a type A (H3) and a type B influenza virus. Of the 28 previously positive clinical specimens, 15 contained an influenza virus A, subtype H3, 1 contained an influenza virus A, subtype H1, and 9 contained an influenza B virus. The subtype of a very weakly positive specimen could not be determined, and two specimens remained negative. The MAbs described here allow for a rapid typing and subtyping of influenza virus isolates and for the type- and subtype-specific detection of influenza viruses in clinical specimens.
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