Infectious Disease
1935, Australia — Edward Holbrook Derrick's investigation of febrile illness in Brisbane abattoir workers
Q fever emerged as a recognized disease entity in the 1930s when outbreaks among abattoir workers and researchers prompted investigations that would eventually reveal an entirely new category of microorganism. The 'Q' in the name stood for 'query,' reflecting the genuine uncertainty that surrounded the illness during the years investigators worked to characterize it. Its history unfolded across two continents nearly simultaneously and produced one of the more dramatic convergences in twentieth-century microbiology.
Historical Narrative
The condition that would be named Q fever first attracted formal medical attention in Queensland, Australia, in 1935, when a cluster of febrile illness appeared among workers at a Brisbane meatworks. Edward Holbrook Derrick, a medical officer with the Queensland Health Department, investigated the outbreak and recognized a pattern of illness he could not match to any known disease. Unable to identify a causative agent with available techniques, Derrick named the condition 'Q fever' in 1937, with the letter standing explicitly for 'query' as a placeholder until the biology could be resolved. Derrick's meticulous clinical and epidemiological documentation established the outbreak's character even as its microbiology remained obscure.
Derrick sent specimens to Sir Frank Macfarlane Burnet at the Walter and Eliza Hall Institute in Melbourne, who succeeded in transmitting the disease to laboratory animals and recognized that the agent behaved differently from known bacteria and viruses. Burnet and his colleague Mavis Freeman proposed in 1939 that the organism responsible was a rickettsia, placing it within a recently established category of intracellular parasites associated with tick-borne diseases. Their work gave the agent a provisional biological home.
Almost simultaneously, and independently, American researchers Herald Roe Cox and Gordon Davis at the Rocky Mountain Laboratory in Hamilton, Montana, were investigating febrile illness in the region and isolating organisms from ticks. Cox succeeded in culturing what proved to be the same organism that Burnet had encountered on the opposite side of the world, though neither group knew initially of the other's parallel progress. The organism was subsequently named Coxiella burnetii in recognition of both scientists' contributions, an act of nomenclatural diplomacy that acknowledged the transatlantic duplication of discovery.
Early investigators were struck by the agent's unusual resilience compared to other rickettsiae. Laboratory workers and researchers who handled infected materials in the late 1930s and 1940s frequently contracted the illness themselves, and several research facilities experienced outbreaks among their own staff, making Q fever simultaneously the object of investigation and a persistent hazard of that very investigation. These laboratory-acquired infections sharpened awareness of the agent's capacity to spread without the tick vectors associated with classical rickettsial diseases, forcing a revision of assumptions about transmission routes.
During the Second World War, Q fever attracted military medical attention as cases appeared among troops in Europe and the Mediterranean theater. Military physicians and epidemiologists compiled case series from Italy, Greece, and North Africa, attempting to characterize the illness's clinical course and determine its distribution in livestock populations, since animal reservoirs had been implicated in transmission. This wartime experience vastly expanded the geographic scope of documented cases and brought substantial new research resources to bear.
In the postwar decades, serological tools developed by researchers in the United States and Europe allowed retrospective studies linking outbreaks to specific animal contact, establishing that cattle, sheep, and goats served as principal reservoir hosts in the transmission chains investigators had long suspected. The history of Q fever research was thus also a history of the gradual recognition that the boundary between human and veterinary medicine was far more permeable than nineteenth-century frameworks had suggested.
Key Historical Figures
Historical narrative only — this page describes how Q fever was understood historically. It is not medical advice and does not describe current diagnosis or treatment. Sourced from verified medical history references (NIH, Encyclopaedia Britannica, and standard medical history texts). See our medical disclaimer.