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An antigenic determinant common to the major capsid polypeptide (VP1) of simian virus 40 (SV40) and polyoma virus is described. Antisera prepared against intact viral particles reacted only with cells infected with the homologous virus by immunofluorescence tests (IF). However, antisera prepared against disrupted SV40 particles reacted in IF with both polyoma- and SV40-infected permissive cells. The cross-reaction with polyoma was localized to VP1 by the following evidence. (i) The IF cross-reaction was inhibited by preincubation of the antiserum with purified SV40 VP1; (ii) purified radiolabeled polyoma VP1 was precipitated by the cross-reactive serum, and this reaction was inhibited by unlabeled SV40 VP1; (iii) other antisera prepared against purified SV40 VP1 or polyoma VP1 reacted in IF with both SV40- and polyma-infected permissive cells. These cross-reacting antisera also reacted in IF with permissive cells infected with BK virus, rabbit kidney vacuolating virus, and the stumptailed macaque virus, suggesting that all members of the polyoma-SV40 subgroup share a common antigenic determinant located in their major capsid polypeptides.

Common structural antigen of papovaviruses of the simian virus 40-polyoma subgroup