AdvertisementNew CDC isolation guidelines raise concerns among health expertsDecember 28, 2021Pien HuangfacebookEmailPeople wait in line at a testing site to receive a free COVID-19 PCR test in Washington, D.C. On Monday, the CDC announced that people can isolate for five days, instead of 10, after they've tested positive for the coronavirus and have no symptoms. (Anna Moneymaker/Getty Images)