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Species/Subspecies: Mannheimia haemolytica
Etymology: Genus name: named after the German microbiologist Walter Mannheim.
Species epithet: hemolysing.
Significance:  [Very important]   
Old Species Name(s):Pasteurella haemolytica, biotype A
Type Strain: J.A. Watt 1266A&B = ATCC 33396 = CCUG 408 and 12392 = NCTC 9380.
Macromorphology (smell):
Mannheimia haemolytica Mannheimia haemolytica Mannheimia haemolytica 
Mannheimia haemolytica Mannheimia haemolytica Mannheimia haemolytica 
Medium sized greyish colonies (2-3 mm in diameter). Give a weak hemolysis on horse blood agar, which is easier to observe if the colonies are removed. The hemolysis is easier to observe on bovine blood agar.
Micromorphology: Nonmotile small rod
Gram +/Gram -:
Fig. 60:7. Gram staining of Mannheimia haemolytica, strain PAT 4483/10. The length of the scale bar corresponds to 5 µm. Date: 2010-10-06.

 Fig. 60:8. Gram staining of Mannheimia haemolytica, strain PAT 4483/10. The bacteria at the arrows are probably dividing. The length of the scale bar corresponds to 5 µm. Date: 2010-10-06.

 Fig. 60:9. Gram staining of Mannheimia haemolytica.

Metabolism: Facultatively anaerobic
Other Enzymes: Tryptophanase -, ornithine decarboxylase -, urease -.
Biochemical Tests: Citrate -, hydrogen sulphide (H2S) -, methyl red -, Voges-Proskauer -.
Fermentation of carbohydrates:
Other carbohydrates: Adonitol -, dextrin +, D-fructose +, D-fucose -, D-galactose +, D-glycogen -, mannose -, D-melezitose -, D-melibiose -, D-ribose +, L-sorbose -, xylitol -, D-xylose +.
Spec. Char.:
Special Media:
Mannheimia haemolytica 
Hosts: Cattle, sheep
Disease (Swedish):Luftvägsinfektion
Disease (English):Bovine respiratory disease (BRD) or bovine pneumonic mannheimiosis (pasteurellosis). In English also known as "shipping fever".
Clinical Picture:
Virulence Factors: Adhesines (two membrane proteins OmpA and Lpp1), capsule, endotoxin (toxic for bovine endothelial cells) and leukotoxin (pore-forming cytolysin), which has a potent effect on neutrophiles of ruminants that results in cell death.
Genome Sequence:
Acc-noStrainSize (bp)Genome
CP005972.1 D153 2 681 844 1c + 0 

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
AF060699 NCTC 9380T 1 504 

 Mannheimia haemolytica
Six 17 have been described within genus Mannheimia. The relationship between members within the closely related genera Actinobacillus, Haemophilus and Pasteurella is very uncertain since none of these genera forms monophyletic clusters.
Reference(s): No. 108

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Swedish University of Agricultural Sciences