The FDA authorized the vaccines on Friday in children as young as 6 months of age, soon after its advisory panel also unanimously recommended the shots earlier this week
Beijing is racing to track a Covid-19 outbreak that may have been spreading in the capital for a week raising the prospect of more stringent restrictions.
A first-of-its-kind test that detects coronavirus in the breath can produce results in less than 3 minutes, but the real-world impact could be limited.
The next generation of COVID-19 vaccines should be able to fight off a new strain and be given each year, a panel of experts that advises the FDA said.
The number of people killed by the coronavirus surged by more than 40% last week, due to changes in how COVID-19 deaths were reported across the Americas.