Centers for Disease Control (CDC) Travel Information
Current travel health information on destinations world-wide, including vaccination information, travel medicine clinics, insect protection, diseases, announcements and outbreaks, and CDC contact information

International Society of Travel Medicine (ISTM)
Includes a Travel Clinic Directory, World Health Organization and Center for Disease Control Updates, related publications, as well as information on travel medicine education and training

National Library of Medicine - MedlinePlus Traveler's Health
Travel information provided by the National Library of Medicine - including news, overviews, prevention and screening, specific travel-related conditions, travel-related issues, clinical trials and research, and travel-health directories and organizations
  

Travel.State.Gov
U.S. Department of State travel Web site - Information provided includes travel requirements, warnings, public announcements, documentation requirements, children and family-related travel information, and travel topics of general interest

World Health Organization (WHO) Infectious Disease Information
Links to descriptions of related activities, reports, news and events, fact sheets and contacts and cooperating partners working in infectious disease