AdvertisementU.S. races to detect and track omicron, hampered by an unwieldy surveillance systemNovember 30, 2021Rob SteinCarmel WrothfacebookEmailA registered nurse stirs a nasal swab in testing solution after administering a COVID-19 test in Los Angeles, Calif. Increased testing could help in efforts to detect and track new variants like omicron. (Mario Tama/Getty Images)
