Difference between revisions of "Mannheimia haemolytica"
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| + | | ''M.haemolytica'' | ||
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| − | '' | + | ''Mannheimia haemolytica'' is a species of the [[:Category:Pasteurella and Mannheimia species|''Mannheimia'']] genus. It is the cause of epizootic pneumonia in cattle known as Shipping Fever, Transit Fever or [[Pneumonic Pasteurellosis|pneumonic pasteurellosis]]. 90% is caused by ''Mannheimia haemolytica'' Biotype A, serotype 1 but also ''[[Pasteurella multocida]]''. It is usually secondary to viral infections such as [[Bovine Parainfluenza - 3|parainfluenza - 3]] or [[Infectious Bovine Rhinotracheitis|IBR]], bacterial infections such as ''Mycoplasma'' or environmental stress. |
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| − | + | ''M.haemolytica'' may contribute to [[Enzootic Pneumonia - Calves|Enzootic pneumonia of calves]];[[Enzootic Pneumonia - Lambs|Enzootic pneumonia of lambs]]; [[Peritonitis|Peritonitis in sheep]] and [[Oedema - Pathology#Permeability type|Permeability types of pulmonary oedema]]. It also causes gangrenous [[Mastitis]] in sheep. | |
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| − | + | ''M.haemolytica'' is beta-haemolytic on blood agar and grows weakly on MacConkey agar. It is odourless. All are ''Mannheimia'' A biotypes and the strains often produce a cytotoxin, known as leukotoxin, which kills leukocytes of ruminants. Leukotoxin is a member of the RTX group toxins, and is probably largely responsible for the pathogenicity of the bacteria in septicaemia and pneumonia. | |
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[[Category:Pasteurella_and_Mannheimia_species]] | [[Category:Pasteurella_and_Mannheimia_species]] | ||
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Revision as of 10:06, 6 August 2010
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This article is still under construction. |
| Also known as: | M.haemolytica |
Mannheimia haemolytica is a species of the Mannheimia genus. It is the cause of epizootic pneumonia in cattle known as Shipping Fever, Transit Fever or pneumonic pasteurellosis. 90% is caused by Mannheimia haemolytica Biotype A, serotype 1 but also Pasteurella multocida. It is usually secondary to viral infections such as parainfluenza - 3 or IBR, bacterial infections such as Mycoplasma or environmental stress.
M.haemolytica may contribute to Enzootic pneumonia of calves;Enzootic pneumonia of lambs; Peritonitis in sheep and Permeability types of pulmonary oedema. It also causes gangrenous Mastitis in sheep.
M.haemolytica is beta-haemolytic on blood agar and grows weakly on MacConkey agar. It is odourless. All are Mannheimia A biotypes and the strains often produce a cytotoxin, known as leukotoxin, which kills leukocytes of ruminants. Leukotoxin is a member of the RTX group toxins, and is probably largely responsible for the pathogenicity of the bacteria in septicaemia and pneumonia.