www.cdc.gov/travel
Centers for Disease Control (US Government).

www.doh.gov.uk/hat/emerg.htm
www.doh.gov.uk/hat/index.htm
Official UK government site: find out what vaccinations you require for your trip and good local information for out-of-the way places.

www.fitfortravel.scot.nhs.uk
Regularly updated information and a vaccination guide for each country.

www.flyana.com
Healthy flying tips.

www.ifrc.org
Directory of Red Cross and Red Crescent Societies worldwide

www.thirdworldtraveller.com/ Travel/TravelHealth.html
Information on diseases and disease risks, health alerts and precautions.

www.tmb.ie/
Tropical medical bureau.

www.tmvc.com.au/info10.html
Country-by-country vaccination guide

http://travelhealth.com
Repository of travel health information

www.tripprep.com
Database of health and safety issues, covering every travel-related malady.

www.tropicalscreening.com
Offers full check-ups for unwell travellers returning from exotic climes.

www.who.int
World Health Organisation

www.who.int/ctd
The World Health Organisation's site for the control of tropical diseases.