Novel coronavirus (20 19, coronavirus pneumonia-19), referred to as "COVID-19", refers to pneumonia caused by novel coronavirus infection on 20 19.
Since 20 19, 12, many cases of unexplained pneumonia with a history of exposure to the seafood market in South China have been found in some hospitals in Wuhan, Hubei Province, and they have been diagnosed as acute respiratory infectious diseases caused by novel coronavirus infection on 20 19.
On February 28th, 2020, WHO's daily report on the situation in COVID-19 showed that the regional and global risk levels were upgraded to the highest level of "very high", which was consistent with the risk level in China.