Bacillus clausii, also known as B. clausii, are spore bacteria in the Bacillus genus. If you haven’t read the page on Bacillus yet, you may want to do that first to understand the subtleties of this genus.
B. clausii was discovered in 1995 from soil and is named after the German bacteriologist, Dieter Claus. Like other Bacillus species, it is Gram-positive and rod-shaped. B clausii tends to occur in long chains. Most strains need some amount of oxygen to grow.
The spores are used as probiotics in humans and animals. They are also used in industrial biotechnology for production of various enzymes in products such as laundry detergent. Plate-based herbicide and insecticide bioassays showed that some of the biosurfactants from some strains have insecticidal and herbicidal activities. These results expand the possibilities for industrial applications of this species.
B. clausii stands apart from the other Bacillus bacteria considered for probiotics because they have an unusual ability to survive in higher pH than the other species. As such, they are categorized in the Bacillus alcalophilus subgroup. They also have natural resistance to many antibiotics and are able to tolerate high levels of sodium chloride levels compared to other species.
Concerns about Bacillus probiotics in general are covered here.
In immunocompromised individuals, the potential for recurrent infections due to the ingestion of B. clausii is possible.
Since probiotic actions of B. clausii strains are strain-specific, it is best to consider the research on studied strains. Look for more information coming soon.
This species is found in products such as:
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