Millions of Americans may struggle to find Covid-19 vaccines this fall, and the shots they do find are likely to be more expensive after the Food and Drug Administration this week narrowed their approvals.
The FDA on Wednesday approved Covid-19 boosters from Moderna Inc., Pfizer Inc., and Novavax for individuals with qualifying conditions that put them at greater risk for the virus. The shots are also approved for seniors age 65 and older, while age limits for children vary by manufacturer.