title: 'Haemophilus gallinarum'--a re-examination.
abstract: The growth factor requirements and other properties of two strains of avian haemophili, labelled as 'Haemophilus gallinarum' (an X- and V-factor-dependent organism) and stored since the 1940s and 1950s, were examined. Both strains were X-factor independent and V-factor dependent and possessed the typical biochemical, serological and pathological properties of H. paragallinarum. In experiments repeating the tests used in the 1930s that reported the existence of X- and V-factor-dependent avian haemophili, we found that the methodology used resulted in reference strains of H. paragallinarum (X-factor independent and V-factor dependent) appearing to be X- and V-factor dependent. It is likely that the early descriptions of the aetiological agent of infectious coryza as an X- and V-factor-dependent organism were incorrect.
authors.affiliation: Department of Primary Industries, Animal Research Institute, Yeerongpilly, Australia.
authors.forename: P J
authors.initials: PJ
authors.lastname: Blackall
authors.forename: R
authors.initials: R
authors.lastname: Yamamoto
mesh_terms: D000818:Animals; D002645:Chickens / Q000382:microbiology*; D003470:Culture Media; D006190:Haemophilus / Q000254:growth & development*; D011201:Poultry Diseases / Q000382:microbiology; D013045:Species Specificity
chemical_list: D003470:Culture Media