<p>Measles is an acute febrile illness that mostly affects children under 5 years old but can affect individuals of all ages. Between 2019 and 2021 Kenya recorded 378 confirmed cases of measles with two deaths. Measles is a priority disease, with weekly case-based data reported through the Integrated Disease Surveillance and Response (IDSR). The surveillance system had not been evaluated before. We sought to evaluate the measles surveillance system in Kenya.</p>