Travelers face special health risks due to factors that reduce resistance to disease like crowding, long waiting hours, disrupted eating habits, and changes in climate and time zone. Routine vaccines for chickenpox, diphtheria, tetanus, measles, rubella, and polio are recommended. Other preventative measures include avoiding unsafe food and water to prevent diseases like cholera and hepatitis A, taking anti-malarial drugs in endemic areas, and getting the yellow fever vaccine if traveling to endemic zones. Travelers should also eat and drink safely, prevent bug bites, stay safe outdoors, avoid contact with animals, reduce germ exposure, and avoid sharing body fluids.