Corona Virus Disease 2019 (COVID-19), referred to as "new corona pneumonia", refers to pneumonia caused by new coronavirus infection in 2019. Since December 2019, some hospitals in Wuhan City, Hubei Province have successively found multiple cases of unexplained pneumonia with a history of South China seafood market exposure, which have now been confirmed as acute respiratory infections caused by new coronavirus infections in 2019. [1-4]
On February 11, 2020, the Director-General of the World Health Organization, Tan Desai, announced in Geneva, Switzerland, that the new coronavirus-infected pneumonia was named "COVID-19" . On February 21, 2020, the National Health and Health Commission issued a notice on revising the English naming of new coronavirus pneumonia, and decided to revise the English name of "new coronavirus pneumonia" to "COVID-19", which is consistent with the name of the World Health Organization. The Chinese name remains unchanged.  On March 4, 2020, the National Health and Medical Commission issued the "New Coronary Virus Pneumonia Diagnosis and Treatment Program (Trial Version 7)". 
On March 11, 2020 local time, World Health Organization Director-General Tan Desai announced that according to the assessment, WHO believes that the current new pneumonia epidemic can be called a pandemic. 
New type of coronavirus pneumonia is in the early rapid change stage.
New crown virus 
China has published the entire genome sequence of a new coronavirus that causes new coronavirus pneumonia, which will help global scientists and public health organizations to join in the development of diagnostic reagents and virus pathogenicity research.
The National Health and Medical Commission has issued Announcement No. 1 to include pneumonitis infected with new-type coronavirus as a Class B infectious disease under the Law on Infectious Diseases Prevention and Control.
According to CCTV news, the Shanghai Epidemic Prevention and Control Work Conference was introduced: Health and epidemic prevention experts emphasized that the identifiable routes of transmission of new coronary pneumonia are mainly direct transmission, aerosol transmission and contact transmission. Direct transmission refers to the infection caused by the patient's droplets of sneezing, coughing, talking, and exhaled gas directly inhaled; aerosol transmission refers to the mixing of droplets in the air to form aerosol, which causes infection after inhalation; contact transmission refers to The droplets are deposited on the surface of the article. After contacting the contaminated hands, they then contact the mucous membranes of the mouth, nose, and eyes, causing infection
The clinical manifestations of patients with pneumonitis infected by the new coronavirus are: fever, fatigue, dry cough are the main manifestations, and upper respiratory symptoms such as nasal congestion and runny nose are rare, and hypoxia and hypoxia will occur . About one-half of the patients develop dyspnea after one week. In severe cases, they progress rapidly to acute respiratory distress syndrome, septic shock, difficult to correct metabolic acidosis, and coagulopathy. It is worth noting that in the course of severe and critically ill patients, there can be moderate to low fever, even without obvious fever. Some patients have mild onset symptoms and no fever. They usually recover after 1 week. Most patients have a good prognosis, and a few patients are critically ill and even die.