CNN  — 

Do you have a sore throat, a runny nose and muscle aches? It could be a common cold, a case of the flu – or Covid-19.

The illnesses all share similar symptoms, sometimes making it hard to distinguish which is putting you under the weather.

Covid-19 cases are continuing to spread as the United States moves into the time of year where allergies are on the rise. As much of the country opens back up and people gather in close proximity, it can be important to know if you are feeling unwell because of seasonal sniffles or Covid-19 – which is why experts have urged vaccinations to reduce risk and protect against infection.