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J Clin Microbiol. 1982 July; 16(1): 22-29

Antigenic characterization of Cryptococcus neoformans serotypes and its application to serotyping of clinical isolates.

ABSTRACT

Antigenic analysis of the four serotypes of Cryptococcus neoformans was carried out by slide agglutination with reciprocal adsorption methods. With this procedure the antigenic patterns of the serotypes were established. Serotypes A and D had antigenic factors 1, 2, 3, 7 and 1, 2, 3, 8, respectively. Serotypes B and C were found to have antigenic factors 1, 2, 4, 5 and 1, 4, 6, respectively. Factor sera, prepared according to the antigenic patterns demonstrated by adsorption studies, proved to be useful for rapidly and accurately identifying C. neoformans serotypes. Some patterns similar to those of the C. neoformans serotypes were observed in five other Cryptococcus species and two Candida species. The proton magnetic resonance spectra of polysaccharides from the C. neoformans serotypes correlated well with their antigenic characteristics. Phenol oxidase test reactions and growth at 37 degrees C were useful criteria for determining which yeasts should be chosen for clinical application of factor sera for serotyping of C. neoformans. Sixty-two Japanese isolates of C. neoformans were serotyped. Fifty-eight of these isolates were serotype A, three were serotype A-D, and one was serotype D.

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