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genus of prokaryotes
Bacillus subtilis Gram.jpg
Bacillus subtilis, Gram stained
Scientific classification
Domain: Bacteria
Division: Firmicutes
Class: Bacilli
Order: Bacillales
Family: Bacillaceae
Genus: Bacillus
Cohn, 1872

Bacillus is a genus of rod shaped bacteria. They are Gram-positive, meaning they have an extra outside cell layer.

Bacilli are partly or wholly aerobic. They do aerobic respiration. They are everywhere in nature. Bacillus includes both free-living (non-parasitic) and parasitic pathogenic species.[1]

Under stressful conditions, they produce endospores. These are not true spores, but like survival pods they can stay in a dormant state for long periods.

Some species of Bacillus are worth noting:

Related pagesEdit


  1. Turnbull P.C.B. 1996. Bacillus. In: Baron S. et al (eds) Barron's medical microbiology. 4th ed, Univ of Texas Medical Branch. ISBN 978-0-9631172-1-2 [1]
  2. Graumann P (ed) 2012. Bacillus: cellular and molecular biology. 2nd ed, Caister Academic Press. ISBN 978-1-904455-97-4 [2]