2019 Wuhan new coronavirus pneumonia population is generally susceptible, from the published cases, there are newborns, elderly and even to 91-year-old patients, the specific which age group is more may not be exactly the same as SARS, this time is more older people, 50-year-old, 60-year-old patients are more. On the other hand, there is a relationship with the degree of exposure, people who travel to Wuhan, Wuhan and the surrounding areas should pay close attention to the history of residential tourism, there is a group of people with the onset of respiratory symptoms such as cough, weakness, breathing difficulties and other manifestations are to be highly concerned about the population. The population is generally susceptible to novel coronavirus pneumonia because there was no novel coronavirus before, so the population is not resistant to it. Some viruses are lifelong immune, such as smallpox and polio, and basically once you get them you will never get them, but some viruses can recur after infection, so if you get the flu this year you may get the flu again next year, because the flu is more variable. New coronavirus pneumonia and 2003 coronavirus gene sequence is very different, the understanding of its virus mostly from the new coronavirus, the Middle East respiratory virus understanding, so the virus specific to further research, for the virus there are a lot of unknown, can be further observation, research specific incidence, so all the people should be protected isolation. Content source: Dr. You Lai