Ammon News - Northwest China's Ningxia Hui Autonomous Region late Tuesday reported a confirmed bubonic plague "Black Death" case in the capital city Yinchuan, according to local media sources.

Ningxia initiated a Level-IV emergency response for plague prevention and control starting 11 p.m., demanding efforts to fully treat the patient and implement comprehensive prevention and control measures.

A study published in the scientific journal "Nature" explained the source of the Black Death in fourteenth-century central Eurasia.

In addition, a research team from the University of Stirling in Scotland, Germany's Max Planck Institute and University of Tubingen has analyzed ancient DNA samples from the teeth of skeletons in cemeteries near Lake Issyk Kul, in Kyrgyzstan.

Plague is a potentially lethal infectious disease that is caused by bacteria called Yersinia pestis that live in some animals - mainly rodents - and their fleas. The bubonic plague is the most common form of the disease that people can get. The name comes from the symptoms it causes - painful, swollen lymph nodes or 'buboes' in the groin or armpit.