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  2. Medical Diseases & Conditions - Mayo Clinic

  3. Disease | Definition, Types, & Control | Britannica

  4. Disease Definition & Meaning - Merriam-Webster

  5. Infectious diseases - Symptoms & causes - Mayo Clinic

  6. Human disease | Definition & Facts | Britannica

  7. Human disease - Classifications, Causes, Symptoms | Britannica

  8. Centers for Disease Control and Prevention

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

  10. All Diseases and Conditions | NIAMS