Pfizer has announced it is developing a potential booster shot to increase efficacy of its Covid-19 vaccine as the delta variant spreads across the U.S. NBC News medical contributor, Dr. Natalie Azar, explains what a booster could mean for those who have received the Pfizer shot and whether other vaccine makers could introduce a third shot as well.
» 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://smart.link/5d0cd9df61b80
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
#Vaccines #Coronavirus #Pfizer
source