Maintenance of Measles Elimination Status in the United States for 20 Years Despite Increasing Challenges. - Mathis, Adria D; Clemmons, Nakia S; Redd, Susan B; Pham, Huong; Leung, Jessica; Wharton, Adam K; Anderson, Raydel; McNall, Rebecca J; Rausch-Phung, Elizabeth; Rosen, Jennifer B; Blog, Debra; Zucker, Jane R; et al. (Clinical Infectious Diseases, 2022)