Alkaline phosphatase, catalase, arginine dehydrolase, lysine decarboxylase, indole, dulcitol, meso-inositol, acid production from D(-)
sorbitol, D(+) mannose, L(+) rhamnose, L(-) sorbose, cellobiose, lactose, sucrose (saccharose), trehalose, raffinose, esculin, salicin
& gas production from D(+) glucose are negative.
sorbitol, D(+) mannose, L(+) rhamnose, L(-) sorbose, cellobiose, lactose, sucrose (saccharose), trehalose, raffinose, esculin, salicin
& gas production from D(+) glucose are negative.
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Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Proteobacteria => Gammaproteobacteria => Pasteurellales => Pasteurellaceae => Haemophilus => Haemophilus agni Kennedy,
Frazier, Theilen and Biberstein 1958. H. agni has been described as a member of the genus Haemophilus. By current standards it
does not qualify for inclusion in the genus.
De Ley et al., (1990) suggested that H. agni & H. somnus be transferred to genus “Histophilus” , “Histophilus ovis” being a senior
synonym for H. agni . However, none of these names are valid, and no types have been designated.
Frazier, Theilen and Biberstein 1958. H. agni has been described as a member of the genus Haemophilus. By current standards it
does not qualify for inclusion in the genus.
De Ley et al., (1990) suggested that H. agni & H. somnus be transferred to genus “Histophilus” , “Histophilus ovis” being a senior
synonym for H. agni . However, none of these names are valid, and no types have been designated.
Gram negative, pleomorphic rods or coccobacilli, long forms containing spherical and
thickened fusiform bodies, non-motile. Presence of capsules is probable.
thickened fusiform bodies, non-motile. Presence of capsules is probable.
Colonies are convex, translucent, 0.5-1.5 mm in diameter and become flattened
peripherally and more sharply contoured edges in 5-10 % CO2. Growth occurs on
hemoglobin cystein agar, chocolate agar and blood agar. Growth is very slight in air.
Hemolysis negative.
X-factor & V-factor are not required. 5-10 % CO2 atmosphere is required for growth.
Growth on MacConkey agar is negative.
peripherally and more sharply contoured edges in 5-10 % CO2. Growth occurs on
hemoglobin cystein agar, chocolate agar and blood agar. Growth is very slight in air.
Hemolysis negative.
X-factor & V-factor are not required. 5-10 % CO2 atmosphere is required for growth.
Growth on MacConkey agar is negative.
The reservoir of Haemophilus agni has not been determined.
Associated with septicemia , meningitis, polyarthritis, myositis, pneumonia, and mastitis of sheep. Experimentally, only suckling mice
are susceptible.
are susceptible.
- 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. - J. G. Holt et al., 1994. Begey’s manual of Determinative Bacteriology, 9-edition, Williams & Wilkins.
Nitrates reduction, oxidase, ornithine decarboxylase, acid production from D(+) glucose,
D(-) fructose, D(+) galactose (weak), maltose (weak), L(+) arabinose (weak), D(+)
xylose (weak) & mannitol (weak) are positive.
Urease test is variable.
D(-) fructose, D(+) galactose (weak), maltose (weak), L(+) arabinose (weak), D(+)
xylose (weak) & mannitol (weak) are positive.
Urease test is variable.
(c) Costin Stoica
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