haemophilus felis haemophilus felis haemophilus felis is a gram-negative species of bacterium of the family pasteurellaceae. a strain of this species was originally isolated from the respiratory tract of a cat with chronic obstructive pulmonary disease, though it was also found in healthy cats. the species may be closely related (on the basis of rpob sequence) to pasteurella multocida. haemophilus felis scientific classification domain: bacteria phylum: pseudomonadota class: gammaproteobacteria order: pasteurellales family: pasteurellaceae genus: haemophilus species: h. felis binomial name haemophilus felisinzana et al., 1999