Morphology of Bacillus cereus

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Last Updated on January 9, 2020 by Sagar Aryal

Morphology of Bacillus cereus

Morphology of Bacillus cereus

Some of the characteristics are:

  1. Bacillus cereus is gram-positive rod-shaped bacilli with square ends.
  2. Occasionally may appear gram variable or even gram-negative with age.
  3. They are single rod-shaped or appear in short chains.
  4. Clear cut junctions between the members of chains are easily visible.
  5. Tissue section staining may appear long and filamentous.
  6. They are straight or slightly curved.
  7. They are non-capsulated.
  8. It contains spores with central spores.
  9. Spores are oval (ellipsoidal) and not swelling the mother cell, and not formed in the animal’s blood and tissues or in aerobic culture.
  10. It is 1×3-4 µm in size.
  11. It is motile and flagellated with peritrichous flagella.
  12. It is motile by two types of motility, swimming and swarming.
  13. Endospores are able to survive long periods of exposure to air and other adverse environmental conditions.
  14. It is a beta-hemolytic bacterium that causes foodborne disease.
  15. Its virulence factors include cerolysin and phospholipase.

Genome Structure

  • The circular chromosome with 5,411,809 nt in length.
  • It contains 5481 genes, 5234 proteins coding, 147 structural RNA and 5366 RNA operons.
  • The plasmid is 5 to 500 kb in size.


  1. Edward J. Bottone. Bacillus cereus, a Volatile Human Pathogen. Clin Microbiol Rev. 2010 Apr; 23(2): 382–398.
  2. LM Wijnands, JB Dufrenne, FM van Leusden. Bacillus cereus: characteristics, behaviour in the gastro-intestinal tract, and interaction with Caco-2 cells. RIVM report 250912003/2005.
  3. Choma C et al. Effect of temperature on growth characteristics of Bacillus cereus International Journal of Food Microbiology 55 (2000) 73–77.
  4. Floristean V., Carmen CreŃu, M. Carp-Cărare. Bacteriological Characteristics of Bacillus cereus isolates from poultry. Bulletin USAMV-CN, 64/2007 (1-2).
  5. Bacillus cereus. Mehrdad Tajkarimi. Materials from Maha Hajmeer.

Morphology of Bacillus cereus

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