Abstract
Fifty-three Australian, seven British, two American and two New Zealand isolates of Moraxella bovis were classified into seven serogroups on the basis of their variable fimbrial (pilus) antigens using whole cell slide agglutination (SA), enzyme-linked immunosorbent assays (ELISA) and tandem-crossed immunoelectrophoresis (TCIE). Although results of serogroup classification by SA and ELISA were identical in 68.7% of isolates, it was found necessary to resolve the discrepancies between the two systems using TCIE. Results suggest that world-wide variation in the potentially host-protective fimbrial antigens of M. bovis may be relatively limited. It is proposed that the previous numerical classifications of British and Australian serogroups are appropriately amalgamated as a result of this latest study and are designated as serogroups A to G inclusive. A protocol for the further serotyping of fresh, fimbriate isolates of M. bovis is suggested.
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