| Mannheimia pernigra |
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Pseudomonadota (Proteobacteria), Class Gammaproteobacteria, Order Pasteurellales, Family Pasteurellaceae, Genus
Mannheimia, Mannheimia pernigra Kuhnert et al. 2021.
Synonyms: Mannheimia ovis Li et al. 2021, Bisgaard Taxon 39.
According to Bisgaard and Christensen (2023), Mannheimia pernigra is an earlier heterotypic synonym of Mannheimia ovis Li et al.
2021.
Mannheimia, Mannheimia pernigra Kuhnert et al. 2021.
Synonyms: Mannheimia ovis Li et al. 2021, Bisgaard Taxon 39.
According to Bisgaard and Christensen (2023), Mannheimia pernigra is an earlier heterotypic synonym of Mannheimia ovis Li et al.
2021.
Gram-negative coccoid or pleomorphic rods, 0.2-0.3 x 0.2-1.5 μm. Non-motile.
On Columbia agar, the colonies are greyish1-2 mm in diameter, circular, raised,
smooth, and semitransparent. Smaller-growing variants can be observed and some
strains might show colony variation. Optimal growth is obtained on TSA with 5%
sheep blood at 37 °C with 5% CO2. Weak beta-haemolysis is produced on 5.0% (v/v)
sheep blood agar. CAMP reaction is negative. No requirement for X- or V-factor.
The Mannheimia ovis strains grow at 12-45 °C, pH 3-11 and 0.5-8.0% (w/v) NaCl;
optimally at 37 °C, pH 9.0 and 1.0% (w/v) of NaCl. No growth on MacConkey agar.
Facultatively anaerobic.
smooth, and semitransparent. Smaller-growing variants can be observed and some
strains might show colony variation. Optimal growth is obtained on TSA with 5%
sheep blood at 37 °C with 5% CO2. Weak beta-haemolysis is produced on 5.0% (v/v)
sheep blood agar. CAMP reaction is negative. No requirement for X- or V-factor.
The Mannheimia ovis strains grow at 12-45 °C, pH 3-11 and 0.5-8.0% (w/v) NaCl;
optimally at 37 °C, pH 9.0 and 1.0% (w/v) of NaCl. No growth on MacConkey agar.
Facultatively anaerobic.
Isolated from the nasopharynx of veal calves in Swizerland and from sheep lungs in China.
The Mannheimia ovis strains were isolated from lungs of dead sheep with hemorrhagic pneumonia.
- Kuhnert P, Brodard I, Schonecker L, Akarsu H, Christensen H, Bisgaard M. Mannheimia pernigra sp. nov., isolated from bovine
respiratory tract. Int J Syst Evol Microbiol 2021; 71:4643. - Bisgaard M, Christensen H. Mannheimia cairinae sp. nov., a novel species of Mannheimia obtained from Muscovy ducks (Cairina
moschata) and reclassification of Mannheimia ovis as heterotypic synonym of Mannheimia pernigra. Int J Syst Evol Microbiol
2023; 73:5947. [abstract] - Li F, Zhao W, Zhu J, Hong Q, Shao Q, Yang S. Mannheimia ovis sp. nov., Isolated from Dead Sheep with Hemorrhagic
Pneumonia. Curr Microbiol 2020; 77:3504-3511.
Positive results for acid and alkaline phosphatase, catalase, esterase, nitrate reduction, oxidase, phosphatase, phenylalanine
deaminase, tyrosine arylamidase, valine arylamidase, acid production from: galacturonate and glucose (without gas production).
Negative results for arginine dihydrolase, citrate utilization, aesculin hydrolysis, esterase lipase, alpha- and beta-glucosidase, alpha-
and beta-galactosidase (ONPG), beta-glucuronidase, gamma-glutamyl-transferase, malonate utilization, lysine decarboxylase,
ornithine decarboxylase, trypsin, chymotrypsin, urease, acid production from: L-arabinose, D-arabitol, cellobiose, dulcitol, D-fucose,
D-galactose, 5-ketogluconate, myo-inositol, lactose, maltose, D-mannose, melibiose, palatinose, raffinose, L-rhamnose, trehalose
and D-xylose.
Variable results for alpha-fucosidase, glycine arylamidase, leucine arylamidase, lipase, protease, acid production from: L-arabitol,
D-mannitol, D-sorbitol, maltose, maltotriose, D-ribose and sucrose.
deaminase, tyrosine arylamidase, valine arylamidase, acid production from: galacturonate and glucose (without gas production).
Negative results for arginine dihydrolase, citrate utilization, aesculin hydrolysis, esterase lipase, alpha- and beta-glucosidase, alpha-
and beta-galactosidase (ONPG), beta-glucuronidase, gamma-glutamyl-transferase, malonate utilization, lysine decarboxylase,
ornithine decarboxylase, trypsin, chymotrypsin, urease, acid production from: L-arabinose, D-arabitol, cellobiose, dulcitol, D-fucose,
D-galactose, 5-ketogluconate, myo-inositol, lactose, maltose, D-mannose, melibiose, palatinose, raffinose, L-rhamnose, trehalose
and D-xylose.
Variable results for alpha-fucosidase, glycine arylamidase, leucine arylamidase, lipase, protease, acid production from: L-arabitol,
D-mannitol, D-sorbitol, maltose, maltotriose, D-ribose and sucrose.
(c) Costin Stoica
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