China has closed the city of Bayannur in its Inner Mongolia region after a case of bubonic plague was identified and confirmed on Tuesday. Visitors are prohibited from entering the affected area.

The patient is being isolated and treated in a hospital, and is in stable condition, according to the Chinese state-run Xinhua News Agency. It is believed the plague was contracted from eating raw marmot meat.

China has issued a level 3 warning for Fatal Bubonic Plague. 

The bubonic plague causes painful, swollen lymph nodes and fever, chills and coughing. Antibiotics can prevent complications and death if they are administered quickly enough.