Update: Influenza Activity - United States and Worldwide, May 20-October 13, 2018. - Chow EJ; Davis CT; Abd Elal AI; Alabi N; Azziz-Baumgartner E; Barnes J; Blanton L; Brammer L; Budd AP; Burns E; Davis WW; Dugan VG; et al. (MMWR. Morbidity and mortality weekly report, 2018)