COVID-19 and the flu are both respiratory illnesses, but they are caused by different viruses. Despite being caused by completely different viruses, COVID-19 and the flu share many similar symptoms. Fever, cough, fatigue, and body aches are common in both infections. This symptom overlap can make it difficult to distinguish between them without testing. Understanding the differences is essential for proper diagnosis, treatment, and prevention for both viruses. If you’re feeling sick, walk into ...