Serogrouping of Bacteroides fragilis subsp. fragilis by the agglutination test

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Abstract
The agglutination technique was used to establish a serological classification scheme for 98 strains of B. fragilis ssp. B. fragilis isolated from clinical specimens and normal human feces. Absorbed [rabbit] antisera were prepared to 7 strains of B. fragilis ssp. fragilis. These 7 absorbed antisera were species and subspecies specific and provided the basis of the serological classification scheme. This scheme was composed of 21 serogroups; 7 of these serogroups contained only 1 group component; the other 14 serogroups were composed of > 1 component. There was a total of 45 serological patterns. This serological scheme may be used for the serological classification of strains of B. fragilis ssp. fragilis and to study the epidemiology of this organism.