Update: circulation of active genotypes of measles virus and recommendations for use of sequence analysis to monitor viral transmission. - Williams, D.; Penedos, A.; Bankamp, B.; Anderson, R.; Hübschen, J.; Mamou, M. Ben; Beck, A.; Brown, D.; Rey-Benito, G.; Evans, R.; Ghoniem, A.; Sangal, L.; et al. (Weekly Epidemiological Record, 2022)