Difference between revisions of "Mannheimia haemolytica"

Revision as of 14:04, 30 June 2010

Cause of epizootic pneumonia in cattle known as Shipping Fever, Transit Fever or pneumonic pasteurellosis (90% caused by Mannheimia haemolytica Biotype A, serotype 1 but also Pasteurella multocida
Usually secondary to viral infections such as parainfluenza - 3 or IBR, bacterial infections such as Mycoplasma or environmental stress
May contribute to Enzootic pneumonia of calves
Enzootic pneumonia in sheep
Peritonitis in sheep
Permeability types of pulmonary oedema
Septicaemia in young lambs
Causes gangrenous mastitis in sheep
Beta-haemolytic on blood agar
Grow weakly on MacConkey agar
Odourless
All are Mannheimia A biotypes (previously Pasterurella haemolytica)
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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-*Cause of epizootic pneumonia in cattle known as Shipping Fever, Transit Fever or [[Respiratory Bacterial Infections - Pathology#Pneumonic pasteurellosis|pneumonic pasteurellosis]] (90% caused by ''Mannheimia haemolytica'' Biotype A, serotype 1 but also ''[[Pasteurella multocida]]''
+*Cause of epizootic pneumonia in cattle known as Shipping Fever, Transit Fever or [[Pneumonic Pasteurellosis|pneumonic pasteurellosis]] (90% caused by ''Mannheimia haemolytica'' Biotype A, serotype 1 but also ''[[Pasteurella multocida]]''
 *Usually secondary to viral infections such as [[Respiratory Viral Infections - Pathology#Parainfluenza- 3|parainfluenza - 3]] or [[Respiratory Viral Infections - Pathology#In Cattle|IBR]], bacterial infections such as ''Mycoplasma'' or environmental stress
 *May contribute to [[Respiratory Bacterial Infections - Pathology#Enzootic pneumonia of calves|Enzootic pneumonia of calves]]