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  1. Infectious diseases - Symptoms & causes - Mayo Clinic

  2. Infectious Disease: Types, Causes & Treatments - Cleveland Clinic

  3. Most Common Infectious Diseases in the U.S. - WebMD

  4. Infectious diseases - Diagnosis & treatment - Mayo Clinic

  5. Infectious disease | Definition, Types, & Causes | Britannica

  6. Infectious Diseases - Overview - Mayo Clinic

  7. Centers for Disease Control and Prevention

  8. Infectious Diseases > Fact Sheets > Yale Medicine

  9. What Is an Infectious Disease Doctor? - WebMD

  10. Infectious Disease | Germs | MedlinePlus