Bacillus circulans (Niallia circulans)

Display:

Gram stain Culture

General information
- Taxonomy
  Family: Bacillaceae
  Genus: Niallia circulans
  Formely: Bacillus circulans
  
  Natural habitats
  Spores are numerous in soil.
  
  Clinical significance
  Usually considered nonpathogenic for humans but may cause wound infections, bacteremia, septicaemia, abscesses and rarely meningitis.
Gram stain
- Gram positive,(variable) rods with spores
  
  0.5-0.8 x 2.0-4.2 µm
  
  Spore shape: ellipsoidal
  Spore position: subterminal, terminal
  Sporangia swelling: positive
Culture characteristics
- Facultative anaerobic
  
  BA: colonies are large, white gray, smooth and on the edge a translucent surface.
  
  The edges are irregular and the colonies can be ß-hemolytic.
  
  13 % of the strains have migrant micro colonies and spreads actively.
  
  They typically have a rhizoid colony.
  
  BBAØ: growth
Characteristics
References
- James Versalovic et al.(2011) Manual of Clinical Microbiology 10th Edition