National Surveillance for Acute Flaccid Myelitis - United States, 2018-2020. - Kidd, Sarah; Yee, Eileen; English, Randall; Rogers, Shannon; Emery, Brian; Getachew, Halle; Routh, Janell A.; Lopez, Adriana S. (MMWR: Morbidity & Mortality Weekly Report, 2021)