FDA Eyes Second Covid-19 Booster Shot

U.S. health regulators are looking at potentially authorizing a fourth dose of a Covid-19 vaccine in the fall, according to people familiar with the matter.

The planning is still in early stages, and authorization would depend on ongoing studies establishing that a fourth dose would shore up people’s molecular defenses that waned after their first booster and reduce their risk of symptomatic and severe disease, the people said.

The Food and Drug Administration, however, has begun reviewing data so it can make a decision, the people said.