title: Infectious coryza: in vivo growth of Haemophilus gallinarum as a determinant for cross protection.
abstract: Four strains of Haemophilus gallinarum representing 3 immunotypes were used in exposure and challenge exposure studies to determine if in vivo growth of the organism would induce cross protection in chickens. Birds which recovered from infection to 1 immunotype were refractory to reinfection with the heterologous immunotype. In contrast, in vitro-produced bacterins produced immunotype-specific protection.
mesh_terms: D000818:Animals; D001428:Bacterial Vaccines; D002645:Chickens; D003429:Cross Reactions; D005260:Female; D006190:Haemophilus / Q000254:growth & development* / Q000276:immunology; D006192:Haemophilus Infections / Q000276:immunology / Q000662:veterinary*; D011201:Poultry Diseases / Q000276:immunology*; D014611:Vaccination / Q000662:veterinary
chemical_list: D001428:Bacterial Vaccines