Belarus is the top country by immunization against measles in the world. As of 2015, immunization against measles in Belarus was 99 %. The top 5 countries also includes Bahrain, China, Bolivia, and Brazil.
Child immunization measures the percentage of children ages 12-23 months who received vaccinations before 12 months or at any time before the survey. A child is considered adequately immunized against measles after receiving one dose of vaccine.