Bacillus pumilus

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Gram stain Culture

General information
- B.licheniformis, B.subtilis, B. amyloliquefaciens and B.pumilus comprise the subtilis group, which has been associated with food borne gastro-enteritis
  
  Taxonomy
  Family: Bacillaceae
  
  Natural habitats
  Spores occur in soil, on bird feathers, may survive severe heat treatment
  
  Clinical significance
  Considered non pathogenic, but may occasionally be an opportunistic pathogen.
Gram stain
- Gram positive, or Gram variable
  
  0.6-0.7 x 2.0-3.0 µm
  
  Spore shape: ellipsoidal / cylindrical
  Spore position: central, paracentral or subterminal
  Sporangia swelling: negative
Culture characteristics
- Obligate aerobic
  
  BA: colonial morphology is variable.
  
  Colonies maybe wrinkled and irregular and they are unpigmented and most are opaque or smooth and become yellowish-brown and hemolysis is variable
  
  BBAØ: no growth
Characteristics
References
- James Versalovic et al.(2011) Manual of Clinical Microbiology 10th Edition