Isolation of Streptococcus suis from swine in Nebraska

Streptococcus suis was isolated from swine with localized and diffuse infections. The isolates (n = 121) were unable to grow in broth containing 6.5% NaCl. Their abilities to hydrolyze esculin were variable, as were their fermentative reactions in lactose, trehalose, raffinose, and inulin. Sorbitol was not attacked by any strain. Serologic reactions were obtained between the isolates and coagglutination reagents prepared from commercially available antisera to streptococcal groups D, R, or S.