You wake up at 6 am feeling achy and chilled. Unsure if you’re sick or just sleep-deprived, you reach for a thermometer. It beeps at 99°F, so you groan and roll out of bed and get ready for work.

Fever is common in the symptomatic stage of COVID-19, and as workplaces and child care spaces reopen, temperature checks are one way officials are trying to identify those sick with the coronavirus.