They have since been transferred to another hospital.
On Tuesday, two people in China were diagnosed with a strain of the plague more infectious than the strain that ravaged Europe in the Dark Ages, sparking a push by authorities to contain the infection and prevent an epidemic.
State media quoted health officials as saying the risk of an outbreak of pneumonic plague, which could prove fatal if left untreated, is minimal and all required precautions were being taken.
Government officials said that the two cases came from Inner Mongolia, and they are now being treated in a hospital in the Chaoyang District in Beijing, CNN reported. An average of seven Americans get the plague every year, the Centers for Disease Control and Prevention reported. Many fearful posts about the disease on Weibo, the country's version of Twitter, have been deleted.
Unlike bubonic plague, which causes obvious painful swollen lymph nodes, pneumonic plague can be misdiagnosed as a different kind of lung infection if doctors aren't on the lookout for it. Acknowledging concerns about the delayed timing of the announcement, Li wrote that "for such infectious diseases, various agencies are working overtime to repeatedly verify, investigate, report and so on, so official notices must be accurate and can not be sent casually".
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The plague is a serious infectious disease caused by Yersinia pestis, a bacteria typically found in mammals and fleas.
The more virulent form is pneumonic plague, which can be transmitted between humans through coughing. The disease becomes pneumonic once it spreads to the lungs.
He added it was still unclear whether humans could contract pneumonic plague from other humans, and that there might be more cases each year than were recorded because "some of the antibiotics that might be used for someone with pneumonia or a chest infection will also cover plague". Bubonic is the most common, and there are typically around a dozen cases in the USA each year.
Social media users have been worrying this is the return of the "Black Death", which killed almost a third of the population in Europe in the 1300s. In the late 1800s, the disease killed millions in China and Hong Kong, as well as nearby port cities. Though, plague is fatal in all cases if left untreated, so it is important to know the exact symptoms and seek out medical attention immediately.
Earlier this year, a couple in Mongolia's westernmost province contracted the plague and died after eating the raw kidney, gallbladder and stomach of a marmot.