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This map tells us the percentage of 1-year olds that have received three doses of a vaccine with combined protection against diphtheria, tetanus, and pertussis.
Data source: UNICEF 2000-2010 Decade Report
- These estimates are based on the United Nations Children’s Fund and World Health Organization databases which combine information from country-specific routine reporting systems, Multiple Indicator Cluster Surveys, and Demographic and Health Surveys, which are all routinely administered.
- DTP3 coverage by 12 months of age is often used as a proxy to evaluate the performance of primary health care and immunization systems.
- The herd immunity level, as established by the US Centers for Disease Control and Prevention, is 85% for diphtheria, and 92%-94% for pertussis. Herd immunity is the state at which a sufficient proportion of the population has been immunized against a disease to provide a level of protection among those who have not been immunized for that disease.