What we know about COVID vaccine booster shots — and when we may need them

Now that almost half the U.S. population is fully vaccinated against COVID-19, many people are wondering how long that protection will last and if they will need a booster shot down the road. Yahoo News Medical Contributor Dr. Kavita Patel and Dr. Betty Diamond, director at the Feinstein Institutes for Medical Research, explain what we know so far about COVID-19 vaccine boosters.