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Oophorectomized, estrogen-treated rats were susceptible to experimental vaginal infection by Candida albicans. After spontaneous clearing of the primary infection, the animals were highly resistant to a second vaginal challenge with the fungus. The vaginal fluid of Candida-resistant rats contained antibodies directed against mannan constituents and secretory aspartyl proteinase(s) of C. albicans and was capable of transferring a degree of anti-Candida protection to naive, nonimmunized rats. This passive protection was mediated by the immunoglobulin fraction of the vaginal fluid and was substantially abolished by preabsorption of the vaginal fluid with C. albicans, but not with Saccharomyces cerevisiae, cells. Vaginal anti-mannan antibodies were also produced by active immunization with heat-killed cells of C. albicans or with a mannan extract when administered via the vaginal route. The protection conferred was comparable to that resulting from clearing of the primary infection. In summary, the data suggest that acquired anticandidal protection in this vaginitis model is mediated at least in part by antibodies, among which those directed against the mannan antigen(s) might play a dominant role.

Rats clearing a vaginal infection by Candida albicans acquire specific, antibody-mediated resistance to vaginal reinfection