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  1. Ear infection (middle ear) - Symptoms & causes - Mayo Clinic

  2. Ear infection (middle ear) - Diagnosis & treatment - Mayo Clinic

  3. Swimmer's ear - Symptoms & causes - Mayo Clinic

  4. Acute sinusitis - Symptoms and causes - Mayo Clinic

  5. Staph infections - Symptoms & causes - Mayo Clinic

  6. What Causes an Outer Ear Infection and How Is It Treated?

  7. Sexually transmitted disease (STD) symptoms - Mayo Clinic

  8. Urinary tract infection (UTI) - Symptoms and causes

  9. Listeria infection - Symptoms & causes - Mayo Clinic

  10. Coronavirus disease 2019 (COVID-19) - Symptoms and causes