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Clostridium botulinum, type-A bacterial colony

Under a low magnification (5x), this image shows a close view of a Clostridium botulinum, type-A bacterial colony, which had formed on the surface of the blood agar growth medium in this Petri dish culture plate, after undergoing a 72-hour incubation period. (Source: Photograph by Dr. Holdeman, Centers for Disease Control and Prevention, 1965. Public Health Image Library ID# 3869, Centers for Disease Control and Prevention, Atlanta, Georgia. Public domain.)

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