Nigeria · Measles Immunization Coverage · % of children 12–23 months

## What this measures

The share of children aged 12–23 months in Nigeria who received a first dose of measles-containing vaccine. Yearly from 1984.

## Why it matters

Measles is one of the most contagious diseases, so outbreaks follow quickly when coverage slips. The WHO puts the coverage needed to stop it spreading at about 95% with two doses, which makes this series an early warning for outbreaks.

## How to read it

Higher is better. Annual, dated December 31 of the reference year. This is the first dose; the second dose, given later, is not in this series.

## What it does not say

It says nothing about the second dose, and averages hide pockets of low coverage where outbreaks start. The estimates combine administrative reports and surveys and are revised each July.

## Source

WHO/UNICEF Estimates of National Immunization Coverage (WUENIC), via World Bank World Development Indicators, indicator `SH.IMM.MEAS`. Licence per the World Bank's indicator metadata: CC BY 4.0. Palanor reads it each month (/api/cron/worldbank-sync) and rewrites the history, so revisions carry through.