Difference between revisions of "Bacillus species"
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* Can cause vascular fragility, leading to [[General Pathology - Haemostasis#Haemorrhagic Disease Due To Vascular Fragility|haemorrhagic disease]]. | * Can cause vascular fragility, leading to [[General Pathology - Haemostasis#Haemorrhagic Disease Due To Vascular Fragility|haemorrhagic disease]]. | ||
| + | |||
| + | ===Overview=== | ||
| + | |||
| + | *Mostly non-pathogenic environmental organisms | ||
| + | *''Bacillus anthracis'' causes anthrax | ||
| + | *''Bacillus licheniformis'' may cause shoradic abortions in cattle and sheep | ||
| + | *''Bacillus cereus'' causes food poisoning in humans and mastitis in cows | ||
| + | |||
| + | |||
| + | ===Characteristics=== | ||
| + | |||
| + | *Large, Gram positive rods | ||
| + | *Produce endospores | ||
| + | *Aerobes or facultative anaerobes | ||
| + | *Grow on non-enriched media | ||
| + | *Motile | ||
| + | *Catalase positive, oxidase negative | ||
| + | *''Bacillus anthracis'' colonies are up to 5mm diameter, flat, dry, grey, with a ground-glass appearance; curled outgrowthsfrom the edge of the colony give a 'medusa head' appearance; non-haemolytic (differentiate from ''Bacillus cereus'') | ||
| + | *''Bacillus licheniformis'' forms dull, rough, wrinkled colonies, with hair-like outgrowths | ||
| + | *Biochemical tests for identification | ||
| + | *Can often tolerate adverse environmental conditions | ||
| + | |||
| + | |||
| + | === | ||
Revision as of 12:09, 17 May 2008
- CAR bacillus in URT infection in cattle and URT infection in rabbits
- Can cause vascular fragility, leading to haemorrhagic disease.
Overview
- Mostly non-pathogenic environmental organisms
- Bacillus anthracis causes anthrax
- Bacillus licheniformis may cause shoradic abortions in cattle and sheep
- Bacillus cereus causes food poisoning in humans and mastitis in cows
Characteristics
- Large, Gram positive rods
- Produce endospores
- Aerobes or facultative anaerobes
- Grow on non-enriched media
- Motile
- Catalase positive, oxidase negative
- Bacillus anthracis colonies are up to 5mm diameter, flat, dry, grey, with a ground-glass appearance; curled outgrowthsfrom the edge of the colony give a 'medusa head' appearance; non-haemolytic (differentiate from Bacillus cereus)
- Bacillus licheniformis forms dull, rough, wrinkled colonies, with hair-like outgrowths
- Biochemical tests for identification
- Can often tolerate adverse environmental conditions