[Traveller's medicine on the Internet].

Abstract The Internet has become an invaluable source of information for both travellers and physicians. Travellers are better informed than previously and expect their physicians to organise the wide variety of information found on the Net. There is no peer review of information on the Net, and the best course for a physician is to use a few, authoritative Web sites such as those of the World Health Organization and the Centers for Disease Control and Prevention. Supplementary information can be found on the Web sites of professional societies such as the International Society for Travel Medicine, the Danish Society for Travel Medicine and ProMED mail.