Co-migrating and shared antigens of selected Pasteurella haemolytica untypable strains.

Bacterial cell envelope preparations from eight untypable strains of Pasteurella haemolytica were compared by sodium dodecyl sulphate-polyacrylamide gel electrophoresis and immunoblotting with rabbit antisera prepared against the eight untypable strains (one untypable strain per rabbit) and with cattle antisera prepared against P. haemolytica serotypes 1, 2, 5, 6, 9 and against one heterologous untypable strain. Numerous comigrating and shared antigens were recognized by the eight rabbit antisera and the P. haemolytica serotype cattle antisera. Comigrating antigens at 43 and 30 kilodaltons (kDa) were recognized by all eight rabbit antisera. Shared antigens, detected by all eight rabbit antisera when reacting against P. haemolytica serotype 1, were recognized at 43, 32, 30, 20 and 15 kDa.