Stretching the time between the first and second doses would greatly accelerate the rate at which people get at least partial protection. But some experts fear it could also lead to new variants.
New studies from Germany and Norway examined cases involving mostly younger people who developed serious and sometimes fatal blood disorders.
The good news: There are more shots available. The challenge is getting people to take them.
Collaborating with devoted colleagues, Dr. Kariko laid the groundwork for the mRNA vaccines turning the tide of the pandemic.
This week, the C.D.C. acknowledged what scientists have been saying for months: The risk of catching the coronavirus from surfaces is low.
As states open vaccines and restaurants to all, wait staff and food service workers are often left behind. Some chefs have even opened pop-up spots to get their employees shots more quickly.
A scientific mission to China proposed further study for a number of topics. Critics and the director of the W.H.O. have weighed in as well.
Pediatricians should be vigilant, experts said, after the release of the largest U.S. study of the syndrome, MIS-C, that can strike young people weeks after their coronavirus infection.
The first successful direct transplant of a trachea is a medical milestone that could help thousands of people with airways damaged by ventilators and other causes.
Meal programs for older adults have long been underfunded. The new economic recovery plan will help.