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A wildlife biologist at Grand Canyon National Park likely died from the plague through his exposure to wild animals that can carry the disease, the National Park Service said Friday

Eric York, 37, was found dead in his home Nov. 2. Following his death, about 30 people who came in contact with him were given antibiotics as a precaution

Park Service officials initially said they suspected the plague or hantavirus

Health officials in Arizona warned in September that the plague appeared to be on the rise

Plague is transmitted primarily by fleas and direct contact with infected animals. When the disease causes pneumonia, it can be transmitted from an infected person to a non-infected person by airborne cough droplets

Cases are treatable with antibiotics, but the Centers for Disease Control and Prevention reports that up to 50 percent are fatal if the disease causes pneumonia. The Coconino County Medical Examiner has said York's lungs were filled with fluid and his body showed signs of pneumonia.