Vaccination against yellow fever is recommended for travelers to areas where yellow fever has been reported, and they should be vaccinated 10 days before the travel at an approved center for the vaccination. When traveling to areas where chloroquine-resistant P. falciparum has not been reported, once-a-week use of chloroquine alone is recommended, but when traveling to areas where chloroquine-resistant P. falciparum has been reported, other agents such as mefloquine, doxycycline, atovaquone/proguanil and primaquine should be chosen. Other recommended immunizations are typhoid vaccine and hepatitis A/B vaccine. Traveler's diarrhea is one of the major health problems in terms of frequency, but antimicrobial prophylaxis is not routinely recommended.