The first description of what may have been Coxiella burnetii was published in 1925 by Hideyo Noguchi, but, since his samples did not survive, it remains unclear as to whether it was the same organism.
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The definitive descriptions were published in the late 1930s as part of research into the cause of Q fever, by Edward Holbrook Derrick and Macfarlane Burnet in Australia, and Herald Rea Cox and Gordon Davis at the Rocky Mountain Laboratory (RML) in the United States.
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Research in the 1920s and 1930s identified what appeared to be a new type of Rickettsia, isolated from ticks, that was able to pass through filters.
Coxiella (gastropod) | ''Coxiella'' (gastropod) | Coxiella |