Epidemiology and Statistics | Q Fever | CDC

Q fever was first recognized as a human disease in Australia in 1935 and in the United States in the early 1940s. The “Q” stands for “query” and was applied at a time when the cause was unknown. Q fever is caused by infection with the bacteria Coxiella burnetii. Cattle, sheep, and goats are commonly infected and people often become …

https://www.cdc.gov/qfever/stats/index.html