“Zombie deer” disease, officially called chronic wasting disease, or CWD, has spread into 24 states and two provinces in Canada, and researchers are worried humans could contract it, given certain circumstances.
The disease is primarily found in free-ranging deer, elk and moose, and has been identified in farmed deer and elk, according to the Centers for Disease Control and Prevention.
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The illness is fairly low in free-ranging deer and elk, but in some areas where the disease is more established, infection rates can top 10 percent, the CDC reported, and localized infection rates of 25 percent have also been reported. The numbers are even higher in the captive deer population with rates as high as 79 percent or four out of every five deer in at least one captive herd.
Chronic wasting disease can take as long as a year after infection before symptoms appear, but when they do, they include drastic weight loss, stumbling, listlessness and other neurologic symptoms.
There have been no recorded human infections, but here's why the CDC is concerned. Studies have suggested that non-human primates, like monkeys, that eat infected meat or come into contact with an infected animal's body fluid, could be at risk. The CDC said the research raises concern there could be a risk to people as well.
Since 1997, the World Health Organization has recommended keeping any meat infected with CWD from the food supply.
With no treatments or vaccines for so-called "Zombie deer" disease, the illness is fatal, although some infected animals may never develop the disease.