Traditional disease prevention and control models include

(1) Protect the susceptible population.

This topic examines the preventive measures of infectious diseases, controls the source of infection, cuts off the route of transmission, and protects susceptible people.

Infectious disease is a disease caused by pathogens, which can spread between organisms. It has the characteristics of infectivity and epidemic. When an infectious disease is prevalent, as long as any one of the three links of the epidemic is cut off, it will not be prevalent. Therefore, the general measures to prevent infectious diseases are to control the source of infection, cut off the route of transmission and protect the susceptible population; Therefore, the measures of strengthening immunization and polio vaccination for children under 6 years old belong to the protection of susceptible people.

Therefore, the answer is: protect the susceptible population.