Category:Pasteurella and Mannheimia species
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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
Pasteurella canis
Pasteurella caballi
Pasteurella aerogenes
- Associated with gastroenteritis and abortion in swine
- Pasteurella may be found in deep pyoderma
Mannheimia
Mannheimia haemolytica
- 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
Mannheimia glucosida
- Previously biotype A11
- Respiratory condition of ruminants
Pages in category "Pasteurella and Mannheimia species"
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