Does J&J's COVID vaccine need a booster shot?

Experts are weighing the need for booster shots of the Pfizer/BioNTech, or Moderna mRNA-based vaccines for Americans who received Johnson & Johnson's one-dose vaccine due to the increasing prevalence of the Delta coronavirus variant. #News #Reuters #J&J #coronavirus #Deltavariant #vaccine #boosterdose Subscribe: http://smarturl.it/reuterssubscribe Reuters brings you the latest business, finance and breaking news video from around the globe. Our reputation for accuracy and impartiality is unparalleled. Get the latest news on: http://reuters.com/ Follow Reuters on Facebook:   / reuters   Follow Reuters on Twitter:   / reuters   Follow Reuters on Instagram: https://www.instagram.com/reuters/?hl=en