Immunologic relationship between Page's and Sawata's serotype strains of Haemophilus paragallinarum.
Immunologic relationship among Page's A, B, and C and Sawata's 1 and 2 serotype strains of Haemophilus paragallinarum was investigated. In cross-protection tests, two distinct type-specific immunities existed among the strains used. All Page's serotype A strains (083, W, Georgia, and Germany) were immunologically similar to Sawata's serotype 1 strain 221, although serotype C strain Modesto was similar to serotype 2 strain H-18. Cross-protection was not observed between these two serotypes. However, strains Spross and 0222 of serotype B lacked pathogenicity and protective antigenicity.
D000818:Animals; D002645:Chickens / Q000276:immunology; D006190:Haemophilus / Q000145:classification / Q000276:immunology*; D012703:Serotyping