Taxonomy
Family: Bacillaceae
Genus: Niallia circulans
Formely: Bacillus circulans

Natural habitats
Spores are numerous in soil.

Clinical significance
Bacillus circulans is rarely pathogenic but can cause opportunistic infections in immunocompromised individuals, such as:

- Wound infections: Particularly in patients with compromised immune systems or underlying health conditions.
- Bacteremia: Rare cases have been reported, especially in hospitalized patients.

B. circulans is more often associated with environmental contamination in clinical samples rather than being a primary cause of infection.
It is generally susceptible to a range of antibiotics.