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  1. Influenza (flu) - Symptoms and causes - Mayo Clinic

  2. Flu Symptoms & Complications | CDC

  3. Flu Symptoms: Common Signs, Treatments, and Complications

  4. Flu Symptoms & Diagnosis | CDC

  5. Flu (Influenza): Causes, Symptoms, Types & Treatment

  6. Similarities and Differences between Flu and COVID-19 | CDC

  7. Symptoms of the Flu: Fever, Aching Muscles, Coughing, and More …

  8. Influenza (flu) - Diagnosis and treatment - Mayo Clinic

  9. Flu Symptoms: Headache, Sore Throat, Chills, and More - Healthline

  10. Influenza (Seasonal) - World Health Organization (WHO)