Health workers disinfect a subway station in Wuhan, China. (Photo: Business Insider/VOV)
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Zhong Nanshan, China’s top respiratory expert, said that no-symptom cases fall into two categories: persons who had close contact with Covid-19 patients, and persons who visited an epicenter of the contagion. He said people need to remain vigilant and continue to wash their hands regularly, wear a mask in public, and stay 2 meters apart if possible.