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COVID-19, cold, allergies and the flu: What are the differences?

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If you have signs or symptoms of coronavirus disease 2019 (COVID-19), it's important that you contact your doctor or clinic right away for medical advice. But COVID-19, the common cold, seasonal allergies and the flu (influenza) cause many similar symptoms. So how can you tell if you have COVID-19? Understand the differences in symptoms that these illnesses cause, as well as how these illnesses spread, are treated and can be prevented.