Rickettsia rickettsii

Rarity: Common

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What Wikipedia says

Rickettsia rickettsii is a Gram-negative, intracellular, cocco-bacillus bacterium that was first discovered in 1896. Having a reduced genome, the bacterium harvests nutrients from its host cell to carry out respiration, making it an organo-heterotroph.

Excerpt from the Wikipedia article “Rickettsia rickettsii”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: CDC, Public domain, via Wikimedia Commons.