Patel MK, et al. - In this retrospective review of global surveillance data, researchers ascertained if measles cases are due to failure of immunisation programmes or vaccine policy failure, which might require changes to vaccination schedules or the number of doses. This investigation analyzed case-based data for cases of measles occurring during 2013–17 submitted to WHO by its member states. According to findings, 63% of cases were due to the failure of the vaccine programme to appropriately vaccinate children. In the period 2013-2017, most measles cases were programmatically preventable (ie, did not receive the age-appropriate number of doses for that country), highlighting the need to improve the effectiveness of existing immunization programs. Similar analyzes should be carried out by individual countries to determine the changes needed to reduce the number of measles cases in their country.