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- (h aemin) and V- (NAD) factor in agar media detected infection by V-factor dep endent Pasteurellaceae (Haemophilus sp.) in three colonies of guineapigs an d a group of rabbits. The 12 Haemophilus strains comprised three API NH cod es classed as Haemophilus parainfluenzae and two codes classed as Haemophil us 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 b etween bacteriological and serological properties of the Haemophilus strain s was not evident. Varying serological relationships occurred between the n ewly isolated Haemophilus strains, [Pasteurella] pneumotropica NCTC 8284 an d Haemophilus strains previously isolated from rats.