Difference between revisions of "Mannheimia haemolytica"

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*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]]''  
 
*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
 
*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]]
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*May contribute to [[Enzootic Pneumonia - Calves|Enzootic pneumonia of calves]], [[Enzootic Pneumonia - Lambs|Enzootic pneumonia of lambs]]
 
*Enzootic pneumonia in sheep
 
*Enzootic pneumonia in sheep
 
* [[Peritonitis - Pathology#Peritonitis|Peritonitis in sheep]]
 
* [[Peritonitis - Pathology#Peritonitis|Peritonitis in sheep]]

Revision as of 14:12, 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 of lambs
  • 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