WHO Immunization Data - Vaccination Coverage

These estimates are based on quantitative data:

1. Country-reported coverage data (official and administrative coverage)
2. Survey coverage (from survey final reports, and complying with minimum set of quality criteria), and are informed by contextual information (e.g., stock-outs, changes in schedule, and other relevant information where available and appropriate).

As such, these estimates are affected by the availability and quality of the underlying empirical data.