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The serological relationship between the two vesicular stomatitis virus (VSV) strains Indiana (VSV-Ind) and New Jersey (VSV-NJ) were analyzed by using an enzyme-linked immunosorbent assay (ELISA). Immunoglobulin G responses, defined by their resistance to treatment with 2-mercaptoethanol, were assessed by ELISA by using sucrose gradient-purified VSV or purified VSV glycoproteins (G) as antigens. When low doses (10(6) PFU) of live VSV or 10(8) PFU of UV-inactivated virus were given intraperitoneally (i.p.), only non-cross-reactive antibody responses were observed in a primary immune response. However, when 10(6) PFU of live VSV were injected intravenously (i.v.), cross-reactive antibodies were generated; anti-VSV-NJ antibodies cross-reacted more against VSV-Ind than did anti-VSV-Ind antibodies against VSV-NJ. When 10(8) PFU of live VSV or UV-inactivated VSV mixed with complete Freund adjuvant was given i.p., high levels of cross-reactive antibodies detectable by ELISA were induced in primary and secondary responses. When purified G protein was used instead of purified whole virus in the ELISA, the cross-reactivity was found to be asymmetrical after immunization with live VSV given i.v. but not after i.p. inoculation; anti-VSV-NJ sera bound almost equally well to VSV-Ind G protein, whereas anti-VSV-Ind sera bound virtually exclusively to the G protein of the homologous serotype. The data suggest that immunization with VSV given i.p. results in a more specific, i.e., less cross-reactive, response than that either after i.v. infection or after the virus antigen is made available in great amounts or if it persists for prolonged periods when given i.p. together with complete Freund adjuvant. The unique determinants were immunodominant because they induced antibodies preferentially, whereas partially shared determinants induced antibody responses asymmetrically, more slowly, and with lower titers. Interestingly, the asymmetric cross-reactivity of anti-VSV antibodies, as measured by ELISA, against purified VSV G was opposite that observed for cytotoxic T cells.

journal of virology

Antibodies against the two serotypes of vesicular stomatitis virus measured by enzyme-linked immunosorbent assay: immunodominance of serotype-specific determinants and induction of asymmetrically cross-reactive antibodies