The recommendation will change guidance by the agency in May saying that vaccinated individuals did not have to wear masks indoors or out because of protection afforded by vaccines.
The changes to ongoing trials run by Moderna and Pfizer and its German partner BioNTech could delay the availability of the vaccine to children between the ages of 5 and 11 beyond the hoped-for timeline of early fall, although it is unclear by how much.
Often, the involuntary contractions are a temporary annoyance. But some people can get them for days at a time, disrupting their lives and causing misery.
The vaccines are proven safe and are more widely available than ever, but many Americans are struggling to convince vaccine-hesitant loved ones of the importance of getting the shots.