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Immunogenicity of chemical typhus corpuscular vaccine and radioantigen obtained from rickettsia prowazekii


, : Immunogenicity of chemical typhus corpuscular vaccine and radioantigen obtained from rickettsia prowazekii. Zhurnal Mikrobiologii Epidemiologii i Immunobiologii (1): 73-76

The protective activity of chemical typhus vaccine and R. prowazekii corpuscular radioantigen (CRA) was studied. Guinea pigs were immunized with doses of 32 and 48 antigenic units. Antibody production was assayed in the complement fixation test. On days 7, 15, 21, 30 and 60 after immunization the animals were challenged with R. prowazekii introduced in an amount of 105 minimum embryonal infective doses (MEID). On day 30 some of the animals were challenged with 103 MEID of R. typhi. The results demonstrated that both preparations were highly immunogenic and capable of protecting most of the animals from 105 MEID of R. prowazekii. Immunity developed earlier after immunization with CRA. The guinea pigs immunized with CRA, purified in percoll density gradient, and challenged with 103 MEID of R. typhi on day 30 showed a high level of cross immunity. In all control animals high fever and periorchiosis were observed.

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