[Serological typing of the somatic antigens of Pasteurella multocida strains isolated from poultry and mammals].

Somatic antigens were used for the serotyping of a total of 80 Pasteurella multocida strains isolated from birds with acute and chronic form of cholera as well as from mammals with bronchopneumonia. The investigations made use of the agglutination reaction between factorial sera (0:1, 0:2, 0:3, 0:5, 0:6, 0:8, 0:9, and 0:11) and antigens treated with 1 n HCl. The O-factorial sera behaved specifically after absorption with the respective reference antigens. They showed titers of 1:640 or higher than these with homologous antigens through cross-agglutination reaction. Sixty-nine strains (86.25 per cent) were typed, and 61 per cent of those isolated from birds were shown to belong to groups 0:5 and 0:9, while as many as 62 per cent of the strains isolated from pigs were referred to groups 0:1 and 0:2, and 62 per cent of those isolated from calves--to groups 0:2 and 0:9.