Serological relationship of some V-factor dependent Pasteurellaceae (Haemophilus sp.) from guineapigs and rabbits

Culture of guineapig and rabbit respiratory tracts for bacteria using X-(haemin) and V-(NAD) factor in agar media detected infection by V-factor dependent Pasteurellaceae ( Haemophilus sp.) in three colonies of guineapigs and a group of rabbits. The 12 Haemophilus strains comprised three API NH codes classed as Haemophilus parainfluenzae and two codes classed as Haemophilus aphrophilus/paraphrophilus. Six cell wall lipid profiles were detected, but these were not related to API NH codes. Both bacteriological properties were used to select strains for serological studies but any relationship between bacteriological and serological properties of the Haemophilus strains was not evident. Varying serological relationships occurred between the newly isolated Haemophilus strains, [ Pasteurella] pneumotropica NCTC 8284 and Haemophilus strains previously isolated from rats.