Disease - Wikipedia
Medical Diseases & Conditions - Mayo Clinic
Disease | Definition, Types, & Control | Britannica
Disease Definition & Meaning - Merriam-Webster
Infectious diseases - Symptoms & causes - Mayo Clinic
Human disease | Definition & Facts | Britannica
Human disease - Classifications, Causes, Symptoms | Britannica
Centers for Disease Control and Prevention
Infectious Disease: Types, Causes & Treatments - Cleveland Clinic
All Diseases and Conditions | NIAMS