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Coronavirus is a general term for a very common type of virus that exists widely in nature. 2019-nCoV from Wuhan is a new type of coronavirus that mainly causes infection of the respiratory system. On January 20th, the National Health and Health Commission included pneumonia infected with the new coronavirus as a Class B infectious disease and managed it as a Class A; at the same time, it included the quarantine infectious disease stipulated in the "People's Republic of China's Frontier Health and Quarantine Law".

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