WHO officials have now urged humans to avoid eating any animal infected with the infection.
While there has been a concern it could become a new mad-cow-disease-like epidemic, no evidence yet exists showing humans could be affected if they eat the infected meat.
However, a recently-published study has shown that macaque monkeys can succumb to the disease after consuming tainted meat.
A Centre for Disease Control and Prevention spokesperson said: “Since 2000, the area known to be affected by CWD in free-ranging animals has increased to at least 24 states, including states in the Midwest, Southwest, and limited areas on the East Coast.
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