Blue - yes (123 countries/territories, 57%)

Yellow - no (91 countries/territories, 43%)

The use of measles vaccine in infant immunization programs globally has led to a significant reduction in measles cases and deaths. In addition to providing direct protection to the vaccine recipient, assuming high enough coverage is achieved, immunization against measles results in the indirect protection of unimmunized persons. The shocking laxity of Peru is perhaps interesting. Measles vaccine has several major effects on measles epidemiology like increasing the average age of infection and increasing in the time between epidemics. This lessening of infections can lead to universal eradication. However determination is required.

The crucial relation concerned with eradication can involve the age of the infant at vaccination and whether 1 or 2 shots are given, assuming the vaccine is the same one.
The purposes of the 2-dose schedule is to boost declining antibody concentrations, reach those children who did not get the first dose and avoid the buildup of susceptibles among young adults.