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. 1986 Mar;51(3):832–837. doi: 10.1128/iai.51.3.832-837.1986

Cross-reactive lymphocyte responses and protective immunity against other spotted fever group rickettsiae in mice immunized with Rickettsia conorii.

T R Jerrells, D L Jarboe, C S Eisemann
PMCID: PMC260973  PMID: 3949382

Abstract

Lymphocyte proliferation in response to antigens on spotted fever group rickettsiae was used as a method to investigate the group-specific protective immunity to rechallenge characteristic of this group of rickettsiae at the T-cell receptor level. Spleen cells from Rickettsia conorii-immune C3H/HeJ mice proliferated in response to R. rickettsii Sheila Smith, R. sibirica 246, R. australis, and all tested strains of R. conorii (Casablanca, Moroccan, and Malish). Spleen cells from these mice, however, responded poorly or not at all to antigens prepared from the Kaplan or Hartford strain of R. akari. Proliferation of immune T cells maintained as in vitro cell lines showed a similar pattern of reactivity to these antigens; however, response to R. akari was consistently demonstrable. Spleen cells from C3H/HeJ mice immunized with R. akari responded to R. akari and R. conorii antigens as well as antigens from the other spotted fever group rickettsiae. Lymphocytes obtained from lymph nodes draining foot pads infected with R. conorii or R. akari demonstrated cross-reactivity similar to that found with immune spleen cells. If immunization was accomplished with R. conorii antigen emulsified in Freund complete adjuvant, the resulting lymph node cells were able to respond to R. akari antigens. These data suggest that infection with R. conorii induces a population of T lymphocytes that recognize an antigen(s) that also is found on other spotted fever rickettsiae and that may be responsible for cross-protective immunity. This antigen probably is not a major antigen on R. akari.

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Selected References

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