title: Infectious coryza: cross-protection studies, using seven strains of Haemophilus gallinarum.
abstract: Bacterins prepared from 7 strains of Haemophilus gallinarum were used to immunized chickens for cross-protection studies. Three distinct immunotypes were distinguished. Slight protection between immunotypes was evident for some strains. Airsacculitis could be prevented by use of these bacterins; however, prevention was related to immunotype specificity. Hyaluronic acid found in 2 strains rendered them inagglutinable in homologous antiserums. Treatment with hyaluronidase rendered them agglutinable.
mesh_terms: D000372:Agglutination Tests; D000818:Animals; D001428:Bacterial Vaccines; D002645:Chickens; D003429:Cross Reactions; D005260:Female; D006190:Haemophilus / Q000276:immunology*; D006192:Haemophilus Infections / Q000276:immunology / Q000517:prevention & control / Q000662:veterinary*; D011201:Poultry Diseases / Q000276:immunology / Q000517:prevention & control*; D014611:Vaccination / Q000662:veterinary
chemical_list: D001428:Bacterial Vaccines