This micrograph depicts the gram-positive bacterium Propionibacterium acnes grown in thioglycollate medium at 48 hours.
Propionibacterium acnes is a very common obligate anaerobic, non-spore forming rod, and the etiologic pathogen responsible for acne vulgaris, or pimples. It normally resides in the sebaceous glands of the skin.
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Some of the images on this website are in the public domain.