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Monoclonal antibodies to the VP6 of porcine subgroup I rotaviruses reactive with subgroup I and non-subgroup I non-subgroup II strains

¹ Centro de Microbiología y Biología Celular, Instituto Venezolano de Investigaciones Cientificas (IVIC), Apartado 21827, Caracas 1020 A, Venezuela
and² Centro de Virología Animal CEVAN-CONICET, Serrano 661, 1414 Capital Federal, Argentina

A panel of 10 monoclonal antibodies produced after immunization with two porcine subgroup I rotavirus strains (OSU and A46), and directed against the major inner capsid protein (VP6), fell into six patterns of reactivity when tested against a collection of human and animal group A rotavirus strains. Monoclonal antibodies of pattern 1 recognized all rotavirus strains. Antibodies of patterns 2 and 3 recognized all subgroup II strains and some, but not all, subgroup I strains. Pattern 4 antibodies identified all subgroup I strains and two strains (H2, equine; CC117, porcine) not reactive with reference subgroup monoclonal antibodies (strains non-I non-II). Pattern 5 antibody exhibited the same reactivity as pattern 4 except for not recognizing the non-I non-II equine strain. Pattern 6 antibodies reacted exclusively with subgroup I and non-I non-II rotaviruses of porcine origin. By competitive binding assays, monoclonal antibodies of patterns 4, 5 and 6 appeared to recognize a single antigenic site, which included at least three overlapping epitopes. In immunoblots all monoclonal antibodies, except one, recognized only the trimeric, but not the monomeric form of VP6.

Received 10 October 1989; accepted 13 February 1990.

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