Difference between revisions of "Category:Pasteurella and Mannheimia species"

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*Produce endotoxins which cause host damage and death
 
*Produce endotoxins which cause host damage and death
 
*Their capsules resist phagocytosis
 
*Their capsules resist phagocytosis
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*''Pasteurella'' may be found in [[Bacterial skin infections - Pathology#Deep pyoderma|deep pyoderma]]
  
  
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*''Pasteurella'' may be found in [[Bacterial skin infections - Pathology#Deep pyoderma|deep pyoderma]]
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===''Mannheimia haemolytica''===
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===''[[Mannheimia haemolytica]]''===
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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''
 
*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]]
 
*Enzootic pneumonia in sheep
 
* [[Peritoneal Cavity Inflammatory - Pathology#Peritonitis|Peritonitis in sheep]]
 
* [[Oedema - Pathology#Permeability type|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
 
  
 
===''Mannheimia glucosida''===
 
===''Mannheimia glucosida''===

Revision as of 12:27, 14 May 2010


Overview Pasteurella and Mannheimia

  • Common commensals of the upper respiratory tract and gastrointestinal tract mucosa of animals
  • Usually opportunistic organisms, causing disease during times of stress, low resistance or concurrent infection
  • Not part of the human bacterial flora
  • Small Gram-negative bacilli or coccobacilli
  • Facultative anaerobes
  • Oxidase-positive
  • May show bipolar staining with polychrome stains such as Wright's stain
  • Capsules contain acidic polysaccharides


Pasteurella Properties

  • Catarrhal odour
  • Produce endotoxins which cause host damage and death
  • Their capsules resist phagocytosis


Pasteurella multocida

Pasteurella pneumotropica

===Bibersteinia trehalosi

Pasteurella canis

Pasteurella caballi

Pasteurella aerogenes

Mannheimia

Mannheimia haemolytica

Mannheimia glucosida

  • Previously biotype A11
  • Respiratory condition of ruminants