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Candida albicans ribosomes were prepared from mechanically disrupted cells through differential centrifugation and purification in a sucrose-ammonium sulfate solution. The ribosomes were analyzed chemically and physically and exhibited characteristics of eucaryotic ribosomes (78S). ICR female mice were immunized with two subcutaneous inoculations, 2 weeks apart, of 100 microgram of ribosomes (expressed as ribosomal protein). Immunized mice were challenged either intraperitoneally or intravenously with a lethal dose of live C. albicans cells. The 31-day survival rate of immunized mice challenged intraperitoneally was 64% (mean value) versus 27% in controls; in intravenously challenged mice the survival rate of the immunized animals was about 60%, with no survivors among the controls. In intravenously challenged mice, incomplete Freund adjuvant enhanced the protection elicited by the ribosomes. Protection by ribosomal immunization was obtained against challenge doses causing chronic and acute infection.
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