There are at least three categories of people susceptible to the new coronavirus: 1) the elderly, who have a higher mortality rate after infection, probably related to the aging of the elderly organs and reduced immunity. 2) people with relatively low immunity, such as those who have some underlying diseases, while the immune function is damaged and resistance is reduced, are more likely to be infected. 3) people with respiratory disease or hypertension and diabetes, People with basic respiratory diseases or hypertension or diabetes, that is, people with these basic diseases have a poor lifestyle and reduced immunity, resulting in a higher mortality rate after being infected. So the new coronavirus infection and seasonal influenza infection is very similar to the population, mainly from the respiratory tract infection, immunocompromised, the elderly and patients with underlying diseases are more susceptible.