Immunization, DPT (% of children ages 12-23 months)
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 diphtheria, pertussis (or whooping cough), and tetanus (DPT) after receiving three doses of vaccine.
WHO and UNICEF (http://www.who.int/immunization_monitoring/routine/en/).