Do you need a booster shot if you’re vaccinated and have had COVID-19?

“Waiting until your natural immunity goes away is a problem because we don’t know how to track that,” Phil Felgner, PhD, the director of the Vaccine Research & Development Center at the University of California, Irvine, told Healthline. The durability of the COVID-19 vaccines and boosters, on the other hand, has been “really remarkable,” he said. … Felgner and his colleagues at Irvine have been working on a blood test intended to measure immune response among people who have been vaccinated or have had COVID-19.