Mannheimia ruminalis
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Pasteurellales, Family Pasteurellaceae, Genus Mannheimia,  
Mannheimia  ruminalis
Angen, Mutters, Caugant, Olsen and Bisgaard 1999.
Two distinct phenotypic groups: biovar 1 (do not ferment maltose or dextrin, show variable reactions for fermentation of D-Sorbitol  
and D-xylose and correspond to Bisgaard Taxon 18 biovars 1 and 3 , Bisgaard et al., 1986) and biovar 2 (ferment maltose and  dextrin
and correspond to
M. haemolytica biogroup 8D, Angen et al., 1997).

Historical synonyms:
Actinobacillus lignieresii (Phillips, 1961,1964, 1966), Bisgaard Taxon 18 biovars 1 and 3 ( Bisgaard et al., 1986)
and
M. haemolytica biogrup 8D ( Angen et al., 1997)
Cells are Gram-negative, nonmotile, small rods or coccobacilli .
Regular, smooth, and graysh on blood agar; 1-2 mm in diameter, nonhemolytic
colonies. Growth on MacConkey is variable.
Isolated from the rumen of sheep or cattle.
Virulence factors have not been described. Not associated with disease.
  1. Mutters R., Angen Ø., Bisgaard M. 2004. Genus V. Mannheimia. In:  Bergey’s Manual of Systematic Bacteriology, Second edition,
    Vol two, part B, George M. Garrity (Editor-in-Chief),   pp. 907-911.
  2. W.M. Janda, R. Mutters, 2006. Pasteurella, Mannheimia, Actinobacillus, Eikenella, Kingella, Capnocytophaga, and other
    miscellaneous Gram-negative rods. In: Topley & Wilson’s Microbiology and Microbial Infections, 10 edition, Vol. 2, Bacteriology,
    Edward Arnold Ltd.
Nitrates reduction, alkaline phosphatase, catalase, mannitol, D(-) fructose, D(+)
galactose, D(+) glucose (acid), ONPG, sucrose (saccharose) & lactose = positive.

Gelatinase, H
2S (TSI), Voges-Proskauer, urease, arginine dehydrolase, lysine
decarboxylase, ornithine decarboxylase, indole, xylitol, L(+) arabinose, L(-) xylose,
dulcitol, meso-inositol, D(+) melibiose, trehalose, D(+) mannose, L(-) sorbose, inulin,
esculin, α-glucosidase (PNPG) & gas from D(+) glucose = negative.

Oxidase, glycerol, D(-) arabinose, D(-) sorbitol, L(-) fucose, raffinose & salicin = variable.

Biovar 1 - maltose & dextrin negative. Biovar 2 is maltose & dextrin positive.
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