Moderna CEO says fourth COVID-19 shot could be necessary

The CEO of Moderna says that a fourth coronavirus vaccine shot may soon be necessary due to declining efficacy of booster shots: "I still believe we’re going to need boosters in the fall of ’22 and forward," CEO Stephane Bancel said. "This virus is not going away. We’re going to have to live with it."

Why are so many vaccinated people getting COVID-19 lately?

People might mistakenly think the COVID-19 vaccines will completely block infection, but the shots are mainly designed to prevent severe illness, says Louis Mansky, a virus researcher at the University of Minnesota.