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Colonies produced after inoculation with Clostridium botulinum, type-A, strain 2 bacteria

Close view of the surface of a blood agar culture plate, which produced these colonies after having been inoculated with Clostridium botulinum, type-A, strain 2 bacteria and incubated for 48 hours. (Source: Photograph by Dr. Holdeman, Centers for Disease Control and Prevention, 1965. Public Health Image Library ID# 3868, Centers for Disease Control and Prevention, Atlanta, Georgia. Public domain.)