Haemophilus felis
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Pasteurellales, Family Pasteurellaceae, Genus Haemophilus,
Haemophilus felis  
Inzana, Johnson, Shell, Møller and Killian 1999.
Gram-negative, 0.45-0.55 x 1.5-1.7 µm, coccobacilli or small rods, with occasional
filamentous forms.
Colonies on chocolate agar incubated in air plus 10% extra CO2 are raised, smooth,
and rounded 0.5-1.0 mm in diameter after 24 h.
Colonies on Brain-heart infusion agar supplemented with NAD are very adherent and
show yellow pigmentation when collected on a loop.
Weak hemolysis after 3 days incubation. CAMP test negative. Require increased
concentration of CO
2 in incubation atmosphere for primary isolation but this
requirement is lost upon subcultivation. Require V-factor but not X-factor for growth.
Optimum temperature 35-37 °C. Growth on Mac Conkey agar is negative.
Has been isolated from the nasopharynxes of  6 of 28 apparently normal cats and from the lower respiratory tract of a cat with chronic
obstructive pulmonary disease.
Has been isolated from the lower respiratory tract of a cat with chronic obstructive pulmonary disease.
  1. Mogens Kilian, 2004. Genus III. Haemophilus. In: Bergey’s Manual of Systematic Bacteriology, Second edition, Vol two, part B,
    George M. Garrity (Editor-in-Chief), pp. 883-904.
  2. Mary P.E. Slack, 2006. Haemophilus. In: Topley & Wilson’s Microbiology and Microbial Infections, 10 edition, Vol. 2, Bacteriology,
    Edward Arnold Ltd.
  3. Inzana T.J., Johnson J.L., Shell L., MØller K., Kilian M., 1992. Isolation and characterization of a newly identified Haemophilus
    species from cats:Haemophilus felis”. J. Clin. Microbiol., 30, 2108-2112.
Positive results for nitrates reduction, alkaline phosphatase, catalase, H2S production, alpha-glucosidase, acid production from: D(+)
glucose (without gas), mannitol, D(+) galactose, D(+) mannose, lactose, maltose & sucrose (saccharose).

Negative results for oxidase, urease, lysine decarboxylase, ornithine decarboxylase,
ONPG, indole production, acid production from: L
(+) arabinose, D(+) xylose, meso-inositol, D(-) sorbitol, D(+) melibiose, trehalose, raffinose, inulin, esculin
& salicin.
(c) Costin Stoica
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