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  1. Upper Respiratory Infection: Symptoms, Contagious, Treatment

  2. Respiratory tract infection - Wikipedia

  3. Respiratory tract infections (RTIs) - NHS

  4. Acute Respiratory Infection: Causes, Symptoms, and Diagnosis - Healthline

  5. Lung Infections: Common Types and How to Treat Them

  6. Lower respiratory tract infections: What to know - Medical News Today

  7. Common cold - Symptoms and causes - Mayo Clinic

  8. Respiratory syncytial virus (RSV) - Symptoms & causes - Mayo Clinic

  9. Bronchitis - Symptoms and causes - Mayo Clinic

  10. Why Do You Keep Getting Respiratory Infections? - WebMD