Before any trip, it might not be a bad idea to consult this fine site created by the Centers for Disease Control and Prevention. It is easy to use, and visitors can get started by using their online "Yellow Book" feature offered on their homepage. With this feature, visitors can look up travel health information for over 90 countries. Further down the homepage, visitors will note that the "Specific Topics" area contains information on required vaccinations, yellow fever, mosquito and tick prevention, avian influenza outbreaks, and other public health matters. Those persons who might be traveling with special needs will want to take a look at the "Special Needs Travelers" section, as it includes updates on travelers with HIV, disabilities, or those who might be breast-feeding. On the right-hand side of the site, visitors can look over the "Announcements" area and also take a look at their podcast series.