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Human Host

Photo: X-ray of pneumonic plague victim's chest

Human lungs are the most terrifying tools of the plague. Pneumonic plague, seen affecting both lung fields in this x-ray, is the only form of plague spread from person to person. It is transmitted by coughs and sneezes. The fatality rate of pneumonic plague is a staggering 95 percent. Treatment can be effective during the first 24 hours of infection, but plague is often mistaken as the flu. Victims are lucky to live more than 48 hours.

Photograph by Scott Camazine/Alamy