Explore how vaccination affects the spread of measles.
Each dot represents a person with a vaccination status and a disease stage. When people get close together, measles can spread according to the simulation's rules.
🔵 Susceptible — can become infected.
🟡 Exposed — infected, but not yet infectious.
🔴 Infectious — can spread the virus.
🟣 Recovered — recovered from infection.
⚫ Dead — died during the simulated outbreak.
Vaccination reduces the probability of infection in this model. Real-world vaccine effectiveness depends on the number of doses received.
White cross — hospitalized.
Incubation: typically around 11–12 days until symptoms.
Infectious period: about 4 days before through 4 days after rash onset.
Two MMR doses: approximately 97% effective against measles.
Population — number of people in the simulation.
Vaccination — percentage vaccinated.
Initial infections — number infected at the start.
This is a simplified educational model. Its results depend on assumptions about movement, transmission, hospitalization, and mortality. They are not forecasts.
CDC — Manual for the Surveillance of Vaccine-Preventable Diseases