Chronic wasting disease, also known as 'zombie deer disease', is the illness that leaves animals confused and drooling
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It was first detected in Yellowstone National Park in November last year
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Recently, 2 white-tailed deer inside Harpers Ferry National Historical Park in West Virginia tested positive for chronic wasting disease (CWD)
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The disease is caused by misfolded proteins - when proteins do not fold into the correct shape - known as prions
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After infection, prions travel throughout the central nervous system, leaving prion deposits in brain tissues and organs
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The deer affected by it are left drooling, stumbling, lethargic and with a blank stare
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According to the Centers for Disease Control and Prevention, it may take over a year for symptoms in the deer to develop
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No known case of CWD in humans has ever been recorded, according to Fox News
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Studies suggests chronic wasting disease is a risk to monkeys that eat infected animal meat or come in contact with infected animal brains or bodily fluids