Hundreds of people in the United States could already have the new coronavirus, experts found.
Researchers studied the genomes of two coronavirus infections in Washington state, one announced on Jan. 20 and the other reported on Feb. 28.
Hundreds of people in the United States could already have the new coronavirus, experts found.
Researchers studied the genomes of two coronavirus infections in Washington state, one announced on Jan. 20 and the other reported on Feb. 28.