China COVID-19 outbreak time.

The outbreak time in novel coronavirus should start from the end of 20 19, which is about the middle of 12, but in fact their first case should be around 2010/0 in 2009. Similar cases have been found, but they have not been spread or reported to the public in China for various reasons. Due to the limited conditions at that time, the identification ability of unexplained pneumonia was limited, and it was impossible to immediately identify its pathogenic microorganisms or causes, so it was impossible to give a clear answer to the reports of the society, including the news media.