From NBC News.

Robert F. Kennedy Jr. claimed in an interview that the measles vaccine’s effectiveness wanes 4.5% every year. But a study published in 2024 showed that the vaccine’s effectiveness is actually much more consistent, estimating that it wanes just 0.04% per year. Dr. Akshay Syal explains.

» Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC
» Watch more NBC video: http://bit.ly/MoreNBCNews

NBC News Digital is a collection of innovative and powerful news brands that deliver compelling, diverse and engaging news stories. NBC News Digital features NBCNews.com, MSNBC.com, TODAY.com, Nightly News, Meet the Press, Dateline, and the existing apps and digital extensions of these respective properties. We deliver the best in breaking news, live video coverage, original journalism and segments from your favorite NBC News Shows.

Connect with NBC News Online!
NBC News App: https://apps.nbcnews.com/mobile
Breaking News Alerts: https://link.nbcnews.com/join/5cj/breaking-news-signup?cid=sm_npd_nn_yt_bn-clip_190621
Visit NBCNews.Com: http://nbcnews.to/ReadNBC
Find NBC News on Facebook: http://nbcnews.to/LikeNBC
Follow NBC News on Twitter: http://nbcnews.to/FollowNBC
Follow NBC News on Instagram: http://nbcnews.to/InstaNBC