title: Serological response of chickens either vaccinated or artificially infected with Haemophilus paragallinarum.
abstract: The serological response of chickens either vaccinated or artificially infected with Haemophilus paragallinarum (Hpg) serovar A or C was investigated using both a specific hemagglutinin (HA) antigen and a common HA antigen. With Hpg serovar A, both vaccinated and artificially infected chickens produced hemagglutination-inhibition (HI) antibodies to Hpg serovar-specific and Hpg common HA antigens. Most chickens vaccinated with Hpg serovar C had detectable HI antibodies to both types of HA antigen by 3 weeks postvaccination, after which titers gradually declined. In contrast, most chickens artificially infected with serovar C produced HI antibodies to only the common HA antigen; very few of these chickens produced HI antibodies to the serovar-specific HA antigen.
authors.affiliation: Aburahi Laboratories, Shionogi & Co., Ltd., Shiga, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Yamaguchi
authors.forename: Y
authors.initials: Y
authors.lastname: Iritani
authors.forename: Y
authors.initials: Y
authors.lastname: Hayashi
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000276:immunology; D000942:Antigens, Bacterial / Q000276:immunology; D001428:Bacterial Vaccines / Q000276:immunology*; D002645:Chickens / Q000276:immunology*; D006192:Haemophilus Infections / Q000276:immunology / Q000662:veterinary*; D006385:Hemagglutination Inhibition Tests / Q000662:veterinary; D011201:Poultry Diseases / Q000276:immunology*; D012703:Serotyping / Q000662:veterinary; D014613:Vaccines, Attenuated / Q000276:immunology
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D001428:Bacterial Vaccines; D014613:Vaccines, Attenuated