Epidemiology 1. Infectious sources: Measles patients in acute stage 2. Routes of transmission: Droplet spray 3. Population susceptibility It is susceptible to all the people without infection or inoculation e The age of peak incidence was 6 months to 5 years old The incidence of baby under 6m is lower 4. Epidemic features DIVISION OF INFECTIOUS DISEASE AND GASTROENTEROLOGY5 DIVISION OF INFECTIOUS DISEASE AND GASTROENTEROLOGY Epidemiology 1.Infectious sources：Measles patients in acute stage 2.Routes of transmission： Droplet spray 3.Population susceptibility： 4.Epidemic features： ⚫ It is susceptible to all the people without infection or inoculation. ⚫ The age of peak incidence was 6 months to 5 years old. ⚫ The incidence of baby under 6m is lower