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Upper Respiratory Infection: Symptoms, Contagious, Treatment
Respiratory tract infection - Wikipedia
Respiratory tract infections (RTIs) - NHS
Acute Respiratory Infection: Causes, Symptoms, and Diagnosis - Healthline
Lung Infections: Common Types and How to Treat Them
Lower respiratory tract infections: What to know - Medical News Today
Common cold - Symptoms and causes - Mayo Clinic
Respiratory syncytial virus (RSV) - Symptoms & causes - Mayo Clinic
Bronchitis - Symptoms and causes - Mayo Clinic
Why Do You Keep Getting Respiratory Infections? - WebMD