It is the first time for the COVID-19 to infect humans and can be transmitted from person to person [6]. The incubation period can be 2 weeks [7] and even longer. Besides, the virus can spread during the incubation period or recessive infection, which makes it difficult to identify those suspected cases without clinical symptoms for prompt control. By far, the numbers of new infections and deaths have already exceeded the equivalent numbers of cases with SARS. If the situation cannot be fully controlled in Wuhan and Hubei province, the situation may deteriorate in other places of China and the world. The government of all levels have been taking strong leadership to combat the outbreak and in recent days there is a decline trend of new cases. However, some challenges still remain and need to be addressed:
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