Exposure to COVID-19 What to do if you have been a Close Contact with someone diagnosed with COVID-19 Monitor yourself for symptoms. Get a COVID-19 test after the 5th day from your last exposure. Wear a mask* for 10 days from your last exposure. * Mask guidance: Wear a N-95 or KN-95 mask or “double mask” (disposable mask underneath a cloth mask) The mask must cover your nose. The mask must cover your mouth. The mask must fit under your chin. The mask must be snug on your face. Make sure it is easy to breathe.