Pfizer Says Booster Shots of Its Vaccine Are Highly Protective Against Covid

Booster shots in adults who received the Pfizer-BioNTech vaccine were highly effective at preventing symptomatic Covid-19 breakthrough infections, Pfizer announced on Thursday. The company said that out of more than 5,000 Pfizer-BioNTech vaccine recipients enrolled in its study who received a booster shot, only five later developed symptomatic disease, compared with 109 people among a…

What Are Next Steps as C.D.C. Panel Considers Moderna and J. & J. Boosters?

An independent committee of experts that advises the Centers for Disease Control and Prevention meeting on Thursday unanimously recommended extra doses of the Moderna and Johnson & Johnson coronavirus vaccines for tens of millions of Americans. The panel also endorsed the so-called mix-and-match strategy — whether people fully immunized with one company’s vaccine should be…