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Habitat of Bacillus cereus
- Bacillus cereus is isolated from soil, vegetables, milk, cereals, spices, fried rice, cooked poultry and meats, soups and desserts.
- It is also found in mashed potato, beef stew, apples, hot chocolates sold in vending machines and other improper food handling areas.
- In 1887, B. cereus was isolated from air in a cowshed by Frankland and Frankland.
- It is a saprophytic species of Bacillus.
- Vegetative cells and spores are widely distributed in nature.
- It is opportunistic pathogens to immunocompromised patients and sometimes pathogens of man.
- It is not considered as a normal flora of humans but maybe transiently colonize skin or the gastrointestinal or respiratory tracts.
- Endospores show much greater resistance to physical and chemical agents such as heat, cold, desiccation, radiation, disinfection, antibiotics and other toxins.
- It is able to grow either in the presence or in the absence of oxygen.
- It interacts with other microorganisms in the rhizosphere, the region surrounding plant roots.
- It is also found in the gut of microflora of invertebrates and is an intestinal symbiont of arthropods where it exhibits filamentous growth in sowbugs, roaches, and termites.
- Bacillus cereus are not easily killed by alcohol; in fact, they have been known to colonize distilled liquors and alcohol-soaked swabs and pads in numbers sufficient to cause infection.
- The presence of B. cereus in a patient’s stool is not sufficient to make a diagnosis of B. cereus because the bacteria may be present in normal stool specimens, a concentration of 105 bacteria or more per gram of food is considered diagnostic.
- Topley and Wilson’s Microbiology and Microbial Infection. Bacteriology Volume 2. Part IV. Organisms and their biology. Chapter 36. Bacillus cereus, 922.
- Bailey and Scott’s Diagnostic Microbiology. Part 3. Section 4. Chapter 18. Bacillus and Similar Organisms, 281.
- Mackie and McCartney Practical Medical Microbiology. Section B. Bacteria and Related Organisms. Chapter 17. Bacillus, 317.
- Ralph A. Slepecky and H. Ernest Hemphill. The Genus Bacillus—Nonmedical. Prokaryotes (2006) 4:530–562.
- Bacillus cereus. Mehrdad Tajkarimi. Materials from Maha Hajmeer.