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Last Updated on January 9, 2020 by Sagar Aryal
Morphology of Bacillus cereus
Some of the characteristics are:
- Bacillus cereus is gram-positive rod-shaped bacilli with square ends.
- Occasionally may appear gram variable or even gram-negative with age.
- They are single rod-shaped or appear in short chains.
- Clear cut junctions between the members of chains are easily visible.
- Tissue section staining may appear long and filamentous.
- They are straight or slightly curved.
- They are non-capsulated.
- It contains spores with central spores.
- Spores are oval (ellipsoidal) and not swelling the mother cell, and not formed in the animal’s blood and tissues or in aerobic culture.
- It is 1×3-4 µm in size.
- It is motile and flagellated with peritrichous flagella.
- It is motile by two types of motility, swimming and swarming.
- Endospores are able to survive long periods of exposure to air and other adverse environmental conditions.
- It is a beta-hemolytic bacterium that causes foodborne disease.
- Its virulence factors include cerolysin and phospholipase.
- 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.
- Edward J. Bottone. Bacillus cereus, a Volatile Human Pathogen. Clin Microbiol Rev. 2010 Apr; 23(2): 382–398.
- 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.
- Choma C et al. Effect of temperature on growth characteristics of Bacillus cereus International Journal of Food Microbiology 55 (2000) 73–77.
- Floristean V., Carmen CreŃu, M. Carp-Cărare. Bacteriological Characteristics of Bacillus cereus isolates from poultry. Bulletin USAMV-CN, 64/2007 (1-2).
- Bacillus cereus. Mehrdad Tajkarimi. Materials from Maha Hajmeer.