Now that the Delta variant of the novel coronavirus is the most common strain responsible for new infections throughout the United States, experts are beginning to push for a booster shot of the COVID-19 vaccines, no matter which option you received. Pfizer announced this month that it plans to seek FDA authorization for a third dose of its mRNA COVID-19 vaccine in August, citing factors like the rise of the highly transmissible Delta variant and uncertainty about continued efficacy six months or more after the second shot. The founder of Moderna, meanwhile, said in a July 7 interview that he believes a booster shot will “almost certainly” be necessary in the coming months. To read the full story.