False-colour transmission electron micrograph of a group of Coxiella burnetti, an organism that lies between the bacteria and viruses. It is the cause of a highly infectious, influenza-like, febrile illness with pneumonic consolidation named 'Q fever'. It is transmitted to humans via sheep, goats & cattle. Human infection is by inhalation of dust or droplets contaminated from the excreta or other products of infected animals, or by ingestion of infected milk. The organism survives desiccation & is heat-resistant. A complication of Q fever is chronic endocarditis. Magnification: x14,280 at 6x4.5cm size.

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