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Yersinia enterocolitica (Y. enterocolitica) is a Gram-negative short-form bacillus belonging to family Enterobacteriaceae. The Y. enterocolitica antisera are immune sera to be used for identifying groups O3, O5, O8 and O9 of Wauters’ classification of Y. enterocolitica by slide agglutination. These groups are considered as having conspicuous pathogenicity in humans. The antisera are liquid products that contain agglutinins specific to each group shown on the vial label. Each antiserum is prepared by hyperimmunising healthy rabbits with Wauters’ reference strains and inactivating the serum at 56°C for 30 minutes. After removing the cross agglutinins by absorption, the serum is sterilised by filtration