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Pasteurella species and Mannheimia haemolytica (view source)
Revision as of 11:51, 17 December 2007
, 11:51, 17 December 2007no edit summary
*Usually opportunistic organisms, causing disease during times of stress, low resistance or concurrent infection
*Usually opportunistic organisms, causing disease during times of stress, low resistance or concurrent infection
*Not part of the human bacterial flora
*Not part of the human bacterial flora
*Gram-negative bacilli or coccobacilli
*Small Gram-negative bacilli or coccobacilli
*Facultative anaerobes
*Facultative anaerobes
*Oxidase-positive
*Oxidase-positive
*Pneumonia in dogs
*Pneumonia in dogs
*Occasionally infects wounds
===''Pasteurella caballi''===
===''Pasteurella caballi''===
*Equine respiratory tract disease, usually in association with ''Streptococcus equi'' subspecies [[Streptococci#S. zooepidemicus|''S. zooepidemicus'']]
*Equine respiratory tract disease, usually in association with ''Streptococcus equi'' subspecies [[Streptococci#S. zooepidemicus|''S. zooepidemicus'']]
*Equine peritonitis
===''Pasteurella aerogenes''===
===''Pasteurella aerogenes''===
*Beta-haemolytic on blood agar
*Beta-haemolytic on blood agar
*Grow weakly on MacConkey agar
*Grow weakly on MacConkey agar
*Odourless
*All are ''Mannheimia'' A biotypes (previously ''Pasterurella haemolytica'')
*All are ''Mannheimia'' A biotypes (previously ''Pasterurella haemolytica'')
*Strains often produce a cytotoxin, known as leukotoxin, which kills leukocytes of ruminants
*Strains often produce a cytotoxin, known as leukotoxin, which kills leukocytes of ruminants