South Sudan Measles Second Dose (MCV2) Post-Introduction Evaluation: Key Findings, System Bottlenecks and Priority Actions

Please refer to the attached file. Why Measles Vaccination Matters What is measles? Measles is a highly contagious viral disease spread through the air when an infected person breathes, coughs or sneezes. It causes high fever, rash, cough and red eyes. In young and malnourished children, it can lead to pneumonia, severe diarrhoea, blindness, encephalitis and death. Infection also weakens the immune system for months, leaving children open to other infections. Measles is one of the most infectious diseases known, so outbreaks can only be prevented when at least 95% of children receive two doses of a measles-containing vaccine (MCV). MCV1 is given at 9 months in South Sudan. MCV2 gives a second chance to children whose first dose did not produce immunity or who missed MCV1. [WHO measles fact sheet; WHO, 28 Nov 2025]

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