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A taxonomic genus within the familyRickettsiaceae – very small bacteria that include the causative agents of typhus and various other febrile diseases in humans. Like viruses, many of them can only grow inside living cells, and they are frequently transmitted by mites, ticks, or lice.
Rickettsia on Wikipedia.Wikipedia 
Rickettsia on Wikispecies.Wikispecies 
Rickettsia on Wikimedia Commons.Wikimedia Commons 
