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Eric York, a wildlife biologist at Arizona's Grand Canyon National Park, has died after performing a necropsy, or post-mortem examination, on a mountain lion. Officials believe that York contracted the pneumonic plague from the infected animal and succumbed to the disease just days after showing symptoms. On average, only 13 cases of the plague are reported in the US each year and 14 percent prove fatal. It is transmitted primarily by fleas that have had direct contact with an infected animal, but when it causes pneumonia, it can then be passed along by airborne cough droplets.