If you believe you've lost your sense of smell (and do not have a medical reason to explain the loss), experts say to take the symptom seriously.

"At this point I would be fairly confident to put it in the same category as, say, fever," said Munger. "Obviously a variety of things can cause a fever. But if you lose your sense of smell quickly you want to self-isolate and contact your physician to talk about what actionable steps you might want to take."

— Steven Munger, director of the Center for Smell and Taste at the University of Florida, on COVID-19 symptoms. Read more in Loss of smell from coronavirus: How to test your sense at CNN.