Much remains unknown about Omicron, which was spotted by scientists in southern Africa last week and is now known to be present in more than 30 countries. It has mutations that scientists say may allow it to spread more quickly and cause more breakthrough infections in vaccinated or previously infected people, though neither characteristic has yet been confirmed.
Experts welcomed Mr. Biden’s new emphasis on testing. Dr. Michael Mina, a former Harvard University epidemiologist who has been a forceful advocate for greater use of testing, said it could be used both as a medical device, to detect whether someone is sick, and as a public health tool, to determine whether a person is infectious and a risk to others.
The Coronavirus Pandemic: Key Things to Know
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