The document summarizes measles and rubella surveillance data from the WHO European Region from October 2020 to September 2021. It finds that Turkey, Ukraine, and Poland reported the most measles cases, with Turkey reporting 35 cases. It also finds that Azerbaijan, Germany, Turkey, Ukraine, and Poland reported the most rubella cases, with Poland reporting 47 cases. Overall, measles and rubella cases have decreased in the region since 2019, but ongoing vaccination efforts are still needed to eliminate both diseases.