DETECTION OF ATYPICAL TOXIN-PRODUCING PAS TEURELLA STRAINS ON NASAL MUCOUS-MEMBRANES OF CALVES AND THEIR DIFFERENTIATION FROM PASTEURELLA-HAEMOLYTICA AND PASTEURELLA-MULTOCIDA

The bacterial colonisation on nasal mucous membranes of calves at age of 3,5 to 5 months was investigated by cotton swabs. Three Pasteurella species were found (P. multocida subspecies multocida, P. haemolytica , P. avium) as monocausal infection as well as plurycausal infection. P. avium was characterised by colonial morphology, bacterioscopy, bioc hemical properties, polypeptid-pattern in SDS-PAGE and by electronmicr oscopic investigation and was differentiated from P. multocida and P. haemolytica. It is very interesting, that the P. avium strains possess an antigen structure, reacting with monoclonal antibodys directed aga inst the heat labile-toxin of P. multocida subspecies multocida.