Novel coronavirus pneumonia is very contagious. In the early stages, many people who went to Wuhan on business or just lived in Wuhan without any definite experience of contact with the patient got novel coronavirus pneumonia, and it is possible that there were already many infected people around, while being more contagious. Many people come back from Wuhan and Hubei area and come home with their own illness while their family members also develop symptoms. In Beijing, 70% of cases come from aggregated outbreaks, especially family aggregated outbreaks, where one person infects a family, or one person infects many colleagues in a unit, proving to be highly contagious. The number of patients diagnosed worldwide has exceeded 100,000 in just 2 months, and the number of people infected worldwide was less than 9,000 at the end of the SARS epidemic, but now the number has exceeded SARS by a factor of 10 and is far more contagious. spread to the whole family and may infect many colleagues and friends around. Content source: Dr. You Lai