"Quantitative estimation of an individual's risk of infection due to airborne pathogens requires knowledge of the pathogen's infectious dose, in addition to estimates of the pathogen's airborne concentration and the person's exposure duration. Based on our review of the published literature on Q fever, we conclude that the infectious dose of Coxiella burnetii is likely one rickettsia, and that the probability of a single organism initiating infection is approximately 0.9. Findings in experiments exposing guinea pigs to C. burnetii via intraperitoneal injection and inhalation of respirable aerosols firmly support a “one-hit” Poisson model of infection."
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Rachel M. Jones, Mark Nicas, Alan E. Hubbard, Arthur L. Reingold,
https://en.wikiquote.org/wiki/Q_fever
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Q fever
Q fever, or query fever, is a disease caused by infection with the bacterial species Coxiella burnetii in the class Gammaproteobacteria. Infection with C. burnetii is an uncommon disease in humans, but can infect many mammalian species. Q fever results from inhalation of a spore-like small-cell variant, and from contact with bodily secretions, such as milk, urine, feces, vaginal mucus, or semen, of infected animals. In rare cases of Q fever in humans, the disease is tick-borne. C. burnetii was p
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