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Also known as: '''''Pasteurella haemolytica — M. haemolytica
[[Category:Pasteurella_and_Mannheimia_species]][[Category:Cattle]][[Category:Sheep]]
==Introduction==
[[Category:To_Do_-_Bacteria]]
''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 [[:Category:Mycoplasmas|''Mycoplasma'']] or environmental stress.
''M. haemolytica'' may contribute to [[Enzootic Pneumonia - Calves|Enzootic pneumonia of calves]]; [[Enzootic Pneumonia - Lambs|Enzootic pneumonia of lambs]] and [[Peritonitis|peritonitis in sheep]]. It also causes gangrenous [[Mastitis|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.
{{Learning
|literature search = [http://www.cabdirect.org/search.html?rowId=1&options1=AND&q1=%22Mannheimia+haemolytica%22&occuring1=title&rowId=2&options2=OR&q2=%22Pasteurella+haemolytica%22&occuring2=title&rowId=3&options3=AND&q3=&occuring3=freetext&publishedstart=2000&publishedend=yyyy&calendarInput=yyyy-mm-dd&la=any&it=any&show=all&x=60&y=11 ''Mannheimia haemolytica'' publications since 2000]
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[[Category:Pasteurella_and_Mannheimia_species]]
[[Category:Expert_Review]]