Four capsule serogroups (A, B, D, and E) have been described by using passive hemagglutination tests. Serogroups A and D predominant in pasteurelloses of avian species. A new capsule serogroup of Pasteurella multocida has been isolated from turkeys in Arkansas, California, Indiana, Iowa, Missouri, New Jersey, and Virginia. Strains belonging to the new serogroup were somatic serotype 1, 3, 7, or 12, and they varied in virulence for mice and poults. Antisera made in rabbits passively protected mice against challenge with the same serogroup regardless of somatic serotype.
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Rimler et al. (1987) studied this question.
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