Pfizer executive: COVID booster shots likely needed going forward Julia Bergman FacebookTwitterEmail As new, more highly transmissible mutations of COVID-19 continue to circulate in Connecticut and beyond, a top Pfizer executive said Thursday that booster shots are key to fighting the virus going forward. “With the variants we have seen, that are really quite prevalent in the world now, the need to boost is in our reality,” said Angela Hwang who joined Gov. Ned Lamont at his virtual coronavirus briefing Thursday. Earlier in the day, Pfizer and BioNTech reported updated trial data showing their vaccine is around 91% effective at preventing COVID-19, with early signs suggesting it works against a concerning variant that first emerged in South Africa.