Serogrouping of XXXX strains by slide agglutination.

@entity1 @entity5121 @entity294 @entity406 @entity95 @entity2718
Six different agglutinating antisera were obtained by immunizing @entity95 with @entity406 -treated strains of @entity2718 . After appropriate absorption, these antisera were used to define six serogroups designated by the letters A, B, C, D, F, and G. Altogether, 315 strains of @entity2718 from various origins were tested for slide agglutination by these antisera; 312 (99%) of them were agglutinated by one of these antisera. A and C were the most common serogroups. An excellent correlation, ranging from 85 to 100%, was found between the serogroup and the toxigenicity of the strains. The correlation between serogroup and @entity5121 fermentation was higher, ranging from 89 to 100%. The results of this typing were compared with the clinical origin of the strains. Only strains of serogroups A, C, and D were isolated in 153 cases of antibiotic-associated @entity294 . This series included strains from three outbreaks; all the strains in two of the outbreaks belonged to serogroup C, and in the third, all the strains belonged to serogroup A. Strains of serogroups B, F, and G were only found in the stools of asymptomatic neonates or young @entity1 . In the latter samples, strains of serogroups A and D were found in the same ratio as in adults with antibiotic-associated @entity294 , but strains of serogroup C were seldom isolated. In @entity1 treated with antineoplastic drugs and suffering from @entity294 , the distribution of the strains was the same as in cases of antibiotic-associated @entity294 .
