Pfizer to Study Vaccine Breakthroughs to See if Boosters Needed

Pfizer Inc. will examine cases of fully vaccinated people who contracted Covid-19 to determine whether and when a booster shot is necessary, a company official said Monday.

“We will be looking at real world data to help us understand when we might see a change in vaccine effectiveness,” David Swerdlow, clinical epidemiology lead for Pfizer Vaccines, said at the Precision Medicine World Conference.

“We’re going to be monitoring this closely and using immunological data, clinical data, and real world data to help us think about when a booster might be needed,” he said.

More than 10,200 Covid-19 vaccine breakthrough cases ...