A C.D.C. airport surveillance program found the earliest known U.S. cases of Omicron subvariants.
A C.D.C. airport surveillance program found the earliest known U.S. cases of Omicron subvariants.
The results, which have not yet been published in a peer-reviewed journal, suggest that pooled testing of international travelers may be an effective and efficient way to keep tabs on new variants and pathogens