Phylum Proteobacteria, Class Gammaproteobacteria, Order Pseudomonadales, Family Moraxellaceae, Genus Moraxella, Moraxella
ovis (Lindqvist 1960) Henriksen and Bovre 1968.
Synonym: Neisseria ovis Lindqvist 1960.
Gram-negative cocci, arranged in pairs with adjacent sides flattened; division in two
planes at right angles to each other. Tetrad formation may be observed. Nonmotile.
Colonies on blood agar are 2.5 mm in diameter in 48 h, low convex, becoming almost
flat after longer incubation. They are grayish white and slightly smaller and more
opaque than the largest colony forms of M. bovis. The colonies are friable or soft, and
are usually surrounded by a narrow zone of clear hemolysis. Nonhemolytic variants
may arise spontaneously in cultures.
Strict aerobe. Slight growth at room temperature, optimal growth at 35-37 ºC. Can
grow at 42 ºC. No growth on MacConkey agar (some variable exceptions) Drigalski
agar or in minimal medium containing ammonium and acetate.
Isolated from the conjunctiva of sheep and cattle and from upper respiratory sites in sheep (and a horse).
Opportunistic pathogen. May produce keratoconjunctivitis in sheep, often together with M. bovis in cattle.
- S. D. Henriksen and K. Bovre. The Taxonomy of the Genera Moraxella and Neisseria. J Gen Microbiol May 1968 51:387-392.
- Elliot Juni and Kjell Bovre. Order IX Pseudomonadales Orla-Jensen 1921, Family II Moraxellaceae Rossau, Van Landschoot,
Gillis and De Ley 1991 In: Bergey’s Manual of Systematic Bacteriology, Second edition, Vol two, part B, George M. Garrity (Editor-
in-Chief), pp. 411-442.
- Veron (M.), Lenvoise-Furet (A.), Coustere (C.), Ged (C.) and Grimont (F.): Relatedness of three species of "false neisseriae",
Neisseria caviae, Neisseria cuniculi, and Neisseria ovis, by DNA-DNA hybridizations and fatty acid analysis. Int. J. Syst. Bacteriol.,
1993, 43, 210-220.
Positive results for alkaline phosphatase, catalase, esterase, nitrates reduction & oxidase.
Negative results for acid phosphatase, DN-ase, gelatin liquefaction, H2S production, indole production, proteolysis on Loeffler slants,
phenylalanine deaminase, Tween 80 hydrolysis & urease. No acid is produced from carbohydrates.
(c) Costin Stoica