Difference between revisions of "Pasteurella species and Mannheimia haemolytica"
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===Overview ''Pasteurella''=== | ===Overview ''Pasteurella''=== | ||
| − | * | + | *Common commensal of the upper respiratory tract and gastrointestinal tract mucosa of animals |
*Usually opportunistic organisms, causing disease during times of stress, low resistance or concurrent infections | *Usually opportunistic organisms, causing disease during times of stress, low resistance or concurrent infections | ||
*Resist phagocytosis by their capsule | *Resist phagocytosis by their capsule | ||
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===Bacteria Properties=== | ===Bacteria Properties=== | ||
| − | *Short Gram-negative bacilli | + | *Short Gram-negative bacilli or coccobacilli |
*Oxidase-positive | *Oxidase-positive | ||
*May show bipolar staining | *May show bipolar staining | ||
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===''Pasteurella multocida''=== | ===''Pasteurella multocida''=== | ||
| + | |||
| + | *Large grey colonies on blood agar | ||
| + | *Not haemolytic | ||
| + | *Do not grow on MacConkey | ||
| + | *Four capsular serotypes, A,B,D,E and recently F | ||
| + | *Primary and secondary pathogen | ||
| + | *Causes Haemorrhagic Septicaemia in cattle | ||
| + | *Contributes to Atropic Rhinitis in pigs | ||
| + | *Causes septicaemia in chickens and turkeys known as folw cholera | ||
| + | *Involved in Snuffles (Pasteurellosis) in rabbits | ||
| + | *Responsible for secondary infections following primary viral and mycoplasmal infections, especially in the lungs, for example during pig enzootic pneumonia | ||
*Typa A | *Typa A | ||
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*Type D | *Type D | ||
| − | **Causes Atropic Rhinitis along with ''Bordetella bronchiseptica'' | + | **Causes Atropic Rhinitis along with ''Bordetella bronchiseptica'' in pigs |
**Produces an osteolytic toxin, which stimulates osteoclast, inducing bone resorption | **Produces an osteolytic toxin, which stimulates osteoclast, inducing bone resorption | ||
Revision as of 17:25, 16 December 2007
- Pasteurella multocida in Atrophic rhinitis of pigs and atrophic rhinitis
- Peritonitis in sheep
- Permeability types of pulmonary oedema.
- Can be secondary to IBR
- Causes 'Snuffles' in rabbits
- Manheimia haemolytica biotype A serotype 1 (90%) and Pasteurella multocida cause pneumonic pasteurellosis
- Pasteurellosis in pigs
- Can cause vascular fragility, leading to haemorrhagic disease.
- M. haemolytica and P. multocida may contribute to Enzootic pneumonia of calves
- Often follows parainfluenza - 3 infection of cattle
- P. haemolytica in enzootic pneumonia of lambs
- In pyothorax
- P. multocida in cellulitis in cats
Overview Pasteurella
- Common commensal of the upper respiratory tract and gastrointestinal tract mucosa of animals
- Usually opportunistic organisms, causing disease during times of stress, low resistance or concurrent infections
- Resist phagocytosis by their capsule
- Not part of the human bacterial flora
Bacteria Properties
- Short Gram-negative bacilli or coccobacilli
- Oxidase-positive
- May show bipolar staining
- Catarrhal odour
- Produce endotoxins which cause host damage and death
Pasteurella multocida
- Large grey colonies on blood agar
- Not haemolytic
- Do not grow on MacConkey
- Four capsular serotypes, A,B,D,E and recently F
- Primary and secondary pathogen
- Causes Haemorrhagic Septicaemia in cattle
- Contributes to Atropic Rhinitis in pigs
- Causes septicaemia in chickens and turkeys known as folw cholera
- Involved in Snuffles (Pasteurellosis) in rabbits
- Responsible for secondary infections following primary viral and mycoplasmal infections, especially in the lungs, for example during pig enzootic pneumonia
- Typa A
- Commensal in upper respiratory tract of animals in UK
- Commomly repsonsible for dog and cat bite wound infections in humans and animals
- Some strains involved in Atropic Rhinitis, and produce osteolytic toxin
- Type B
- Causes Haemorrhagic Septicaemia of cattle in Southern Europe and Asia
- Type D
- Causes Atropic Rhinitis along with Bordetella bronchiseptica in pigs
- Produces an osteolytic toxin, which stimulates osteoclast, inducing bone resorption
- Type E
- Causes Afican Bovine Haemorrhagic Septicaemia
Pasteurella pneumotropica
- Carried in nasopharynx of many small rodents
- Causes pneumonia in rodents as a secondary disease