COVID isn't the flu. And the flu isn't COVID. Here's what you need to know as we head into respiratory virus season — and how you can know it. Flu vs. COVID-19: Telling Them Apart These viruses can have the appearance of nearly being twins. Fever or feeling feverish and having chills? Cough? Shortness of breath or difficulty breathing? Fatigue? Sore throat? Runny or stuffy nose? Muscle pain or body aches? Headache? Vomiting and diarrhea? Even change in or loss of taste or smell? All are symptoms that someone may have for both. The Centers for Disease Control and Prevention (CDC) report 'COVID-19 and flu can spread from person-to-person between people who are in close contact with one another (within about 6 feet). Both are spread mainly by large and small particles containing virus that are expelled when people with the illness (COVID-19 or flu) cough, sneeze, or talk.' With the COVID-19 pandemic continuing and flu season in the Northern Hemisphere set to begin with a peak around the new year — and as mitigating factors like distancing and wearing masks vary from state to state — there's one way to know for sure what you're dealing with, to put the ID in COVID … or the flu. Testing.