Rickettsiaceae

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What Wikipedia says

The Rickettsiaceae are a family of bacteria. The genus Rickettsia is the most prominent genus within the family. The bacteria that eventually formed the mitochondrion (an organelle in eukaryotic cells) is believed to have originated from this family. Most human pathogens in this family are in genus Rickettsia.

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

Image: CDC, Public domain, via Wikimedia Commons.