This fiery photograph depicts a colony of Clostridium species, which as we all know produce the tremendously potent neurotoxin, botulinum.
From the CDC: “This photograph depicts a colony of Clostridium sp. Gram-positive bacteria, which had been grown on a 4% blood agar plate (BAP) over a 48 hour time period.”
Image credit: CDC/Dr. Holdeman
The Pandora Report 
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