Pfizer
Patients will need a positive COVID-19 test to get a prescription.
The addition of an extra dose came after a preliminary analysis found 2- to 4-year-olds didn't have as strong an immune response as expected.
U.S. health advisers are recommending that most Americans get the Pfizer or Moderna vaccines instead of the Johnson & Johnson shot.
Pfizer says that its experimental COVID-19 pill appears effective against the omicron variant.
WHAT'S HAPPENING
The U.S. is expanding COVID-19 boosters, ruling that 16- and 17-year-olds can get a third dose of Pfizer’s vaccine.
"It’s clear from these preliminary data that protection is maximized with a third dose of our vaccine,” Pfizer CEO Albert Bourla said.
Will we need new shots because of the omicron variant or any other future strains? Here's what we know right now.
The U.S. is buying millions of courses of still-unapproved antiviral drugs that may help reduce severe COVID. Will they be a pandemic game-changer?
Boosters were previously only approved for eligible groups, including people older than 65 and adults with certain health conditions.
Mexico has resisted vaccinating minors ages 12 to 17, in part because the government focused on older adults believed to be more vulnerable.