Deer all over North America are dying due to a mysterious disease that slowly renders the animals’ nervous systems useless.

Scientists are really worried that the infection could find its way to humans.

Chronic wasting disease — also known as “zombie deer disease” — was initially discovered in 1967 in Fort Collins, Colorado, and since then had infected wild herds in 24 states and Canada, also in South Korea and Norway, NPR reported.

“CWD transmits from animal to animal via prions, misfolded proteins that cause other proteins to misfold around them,” NPR reported. “Many prion diseases don’t tend to just harm specific species, but also evolve to overcome those limitations.”

In some herds, up to half of the animals are prions carriers.

However, direct contact is not the only way prions transmit. According to The New York Times, ill animals and cadavers are liable to spread prions via plants and soil, which may be covered with deformed proteins for many years, perhaps even more than 10 years.

An infected animal can live 2 years before showing symptoms — such as a vacant stare, thick saliva, ribs showing or drooping heads — all which become apparent.

So far, no human illnesses as a result of the disease has been reported, and scientists do not have conclusive proof that infected meat has ever be harmful to people, suggesting there exist a “species barrier” between humans and deer....

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