Mannheimia haemolytica
Taxonomy
Morphology
Cultural characteristics
Biochemical characters
Ecology
Pathogenicity
References
Phylum Proteobacteria, Class Gammaproteobacteria, Order Pasteurellales, Family Pasteurellaceae, Genus Mannheimia,
Mannheimia haemolytica Angen, Mutters, Caugant, Olsen and Bisgaard 1999. Corresponds to P. haemolytica biogrup 1 (Bisgaard
and Mutters, 1986).
Historical synonym:
Pasteurella haemolytica Newsom and Cross, 1932. Corresponds to P. haemolytica biogrup 1 (Bisgaard and
Mutters, 1986).
Gram-negative, nonmotile, small rods and coccobacilli .
Colonies are regular, smooth, and graysh on blood agar; 1-2 mm. in diameter
Most strains show a characteristic beta-hemolysis on bovine blood agar
Strains are   V-factor independent and X-factor independent. Growth on MacConkey is
variable.
Growth is mesophilic and facultative anaerobic.
Present in nasopharynx and tonsils (almonds) of sheep & goat and in the intestine of
chicken & turkey.
Pneumonia in cattle and sheep, mastitis in sheep, septicaemia in lambs. Rarely human infections after animal contact.
Potential virulence factors are the polysaccharide capsule, LPS, neuraminidase, transferring binding proteins, sialoglycoprotease,
leucotoxin.
  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.
  3. J. G.Holt et al., 1994.Bergey’s Manual of Determinative Bacteriology, 9-edition, Williams & Wilkins.
  4. Carmen Pinzaru, 2009. Identificarea genurilor Pasteurella, Mannheimia, Actinobacillus.In:D.Buiuc, M.Negut (Ed.),Tratat de
    Microbiologie Clinica, Ed. Medicala, Bucuresti, 859-868.
  5. Buchanan R.E., Gibbons N.E. (co-editors), 1975. Bergey’s  Manual of Determinative Bacteriology, eight edition, The Williams &
    Wilkins Company, Baltimore.
Nitrates reduction, oxidase, alkaline phosphatase, catalase, indole, mannitol, D(-)
sorbitol, D(-) fructose, L(-) fucose, D(+) galactose, D(+) glucose (acid), lactose, ONPG,
maltose, sucrose (saccharose), raffinose & dextrin = positive.
Mannheimia (Pasteurella) haemolytica
Gelatinase, H2S (TSI), Voges-Proskauer, urease, arginine dehydrolase, lysine
decarboxylase, ornithine decarboxylase, xylitol,  L(+) arabinose, L(-) xylose, dulcitol,  
D(+) mannose, L(-) sorbose, L(+) rhamnose, cellobiose, D(+) melibiose, trehalose,
inulin, esculin, salicin, alpha-glucosidase (PNPG) & gas from D(+) glucose = negative.

Glycerol, D(-)arabinose & meso-inositol = variable.
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