With more adults and children going back to work and school in the midst of the coronavirus pandemic, screening for fever, a primary symptom of COVID-19, has never been more important. Health officials, school administrators, and employers are directing people to take their temperatures before leaving the house in the morning. Exergen Corporation, makers of the #1 thermometer sold nationwide, says morning temperature screenings are not sufficient and that taking temperatures both in the evening before dinner and before leaving the house each day gives a more reliable reading. The company has launched a campaign to educate people that morning-only temperature readings, which could miss 50% of fevers, may be misleadingly low, based on the body’s long recognized circadian rhythms.