Identification of colonies of Moraxella bovis by plate epi-immunofluorescence

A modification of the plate epi-immunofluorescence test was found to be a reliable method for the positive identification of colonies of Moraxella bovis when fluorescein isothiocyanate-conjugated globulin prepared against pili from selected strains of M bovis was used. A cross-reaction with other members of the genus Moraxella or other moraxella-like organisms was not observed, except with an equine Moraxella sp, which produced a weak reaction.