1. Centers for Disease Control and Prevention (CDC) Travel Information
http://www.cdc.gov/travel

This website maintained by CDC has abundant and comprehensive information on travel medicine. Besides news of recent disease outbreaks in different parts of the world, the website covers travel information and precautions for different destinations all over the world. In the website is also the Health Information for International Travel 2003-2004 - the "Yellow Book" (http://www.cdc.gov/travel/yb/index.htm) which is published every two years by CDC as a reference for those who advise international travellers of health risks. A Green sheet, on the other hand, contains scores of Sanitation Inspections of International Cruise Ships. (http://www2.cdc.gov/nceh/vsp/vspmain.asp)

2. Travel Health Guide
http://www.travmed.com/thg/travel_health_guide.htm

Published by the Travel Medicine, Inc., the Travel Health Guide serves to provide updated information in different aspects of travel medicine. Some of the chapters of the book include altitude sickness, vaccines, motion sickness and jet-lags, Malaria and other insect borne diseases, and ways to prevent mosquito bites. In the website is also the World Medical Guide at http://www.travmed.com/maps/map.epl where users can click on a map to learn about Disease Risk Information of the respective location (more than 200 countries covered).

3. Hong Kong Travellers' Health Service
http://www.info.gov.hk/trhealth/e_HKTHS.htm

Developed by Port Health Office, Department of Health, this bi-lingual website offers traveller's information with reference to Outbreak News, Health Risks, Health Advice and vaccination information for travellers. Health advices like sexually transmitted disease, mosquito-borne diseases, food and personal hygiene and water purification methods are offered at the website. Concise information on different vaccines are also made available to travellers. Health problems during air flight including earache, leg swelling, dehydration and motion sickness are covered at this informative website.

4. Vaccine Information for the public and health professionals
http://www.vaccineinformation.org/

Information on different vaccines is laid out in a systematic and friendly manner within the website. For each vaccine-preventable disease, there are answers to a pool of frequently asked questions (FAQ). References, recommendations for further reading, and links to other useful resources on the web are also included. Other sections of the website include photos, case histories, vaccine safety to make the website education both for laymen and health professionals.

5. Netdoctor's page on Travel Medicine
http://www.netdoctor.co.uk/travel/index.shtml

The page on travel medicine of the Netdoctor's website has put together a lot of information for travellers from planning of the trip to what dangers to avoid. It outlines risks involved in travelling including general risks, wildlife risk and food risk. Special sections of the website have information on beating jet-lag, safety in the sun, deep vein thrombosis, infectious diseases, diving risks, decompression sickness and altitude sickness, and many others.

6. International Travel and Health 2004
http://www.who.int/ith/

The International Travel and Health 2004 is a WHO publication which offers guidance on a whole range of health risks likely to be encountered during travelling. The information is intended to help the medical profession fully aware of potential risks and to provide appropriate advice to their patients. Areas covered include vaccinations, protection against insects and other disease vectors, or safety in different environmental settings. Risks involved in different destinations and in different parts of the world, and for different types of travelling - from business, humanitarian and leisure travel to backpacking and adventure tours are all outlined in the publication.