International Resource Center » Health
"Jet Lag and Melatonin: Timing is Everything"
http://www.international.umn.edu/travel/jetlag.html
U.S. Center for Disease Control -
Up to date travelers health information; region and disease specific.
http://www.cdc.gov/travel/index.htm
U.S. State Department - Medical information for Americans traveling abroad.
http://travel.state.gov/travel/tips/health/health_1185.html
World Health Organization - Thorough vaccination requirements and health advice.
http://www.who.int/en/