Bacillus subtilis. Coloured scanning electron micrograph (SEM) of Bacillus subtilis bacteria. B. subtilis, or hay bacillus, is an aerobic, gram-positive bacillus(rod-shaped bacterium). It is sometimes pathogenic in humans, causing severe eye infections such as anterior uveitis (inflammation of the middle layer of the eye), or iridocyclitis (inflammation of the iris).
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