Symptoms may include Fever Cough Sore throat Congestion or runny nose Shortness of breath or difficulty breathing Chills or repeated shaking with chills New loss of smell or taste Fatigue Muscle pain Headache Nausea or vomiting Diarrhea The incubation period (ie, time from exposure to symptom onset) ranges from 2 to 14 days, with a median estimated to be only 2 to 4 days for the Omicron variant (1).