ELISA and agglutination test for the serodiagnosis of Yersinia pseudotuberculosis infection

ELISA data based on optical density at 450 nm, along with the results of the agglutination test for 49 serum samples against Yersinia pseudotuberculosis O antigens, are presented. The results of the agglutination test indicate that agglutination was observed against the indicated O antigens at the specified dilutions. Agglutination greater than 1:80 was regarded as positive.