When did COVID-19 start?

COVID-19 generally refers to novel coronavirus. At present, it is considered that the starting date of novel coronavirus is usually 20 19 12.

Novel coronavirus infection is an acute infectious disease. Since 20 19 12, there have been many cases of unexplained pneumonia, which were diagnosed as acute respiratory infectious diseases caused by novel coronavirus infection.

On March 1 1 day, 2020, the World Health Organization considered novel coronavirus infection as a global epidemic. Patients with this disease usually have fever, dry cough, fatigue and other symptoms within 1- 14 days, and severe patients usually have dyspnea and hypoxemia one week after onset.

It is suggested that healthy people should take preventive measures at ordinary times, wear masks when going out, wash their hands frequently, avoid going to crowded places and reduce the probability of getting sick.