Covid-19 test samples and wastewater are helping health officials figure out how widely the Omicron variant might be spreading in the U.S. A glitch in a commonly used test is also making cases easier to find. on.wsj.com
@WSJ3 years ago
Covid-19 test samples and wastewater are helping health officials figure out how widely the Omicron variant might be spreading in the U.S. A glitch in a commonly used test is also making cases easier to find. on.wsj.com
