Centers for Disease Control and Prevention
Centers for Disease Control: Travelers' Health: Disease Directory
The Centers for Disease Control and Prevention provides information on over 40 diseases that travelers might need to be prepared for. Information includes description of disease, risk for travelers, preventive measures and treatment.
CK-12 Foundation
Ck 12: Biology: Protists and Human Disease
[Free Registration/Login may be required to access all resource tools.] Discusses how protists cause human disease.