Routine vaccination is one of the safest and most cost-effective methods to protect against life-threatening diseases in both children and adults. Despite the longstanding success of vaccines, low immunization levels persist. About 20 million children miss out on life-saving vaccines annually, with the poorest and most vulnerable among the least likely to be vaccinated. While many factors contribute to low vaccination rates, one major obstacle is a lack of timely, high-quality data to inform the delivery of immunization services.
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