Avoiding insect and tick bites is the obvious solution for arthropod-borne diseases. Most industrialized countries control their mosquito populations, making it unnecessary to sleep under insect-repellant-treated mosquito netting. But in many parts of the world, mosquito netting is important. Travelers to some countries, even recent residents of these countries, are advised to take antimalarial drugs as prophylaxis. For many viral diseases, such as yellow fever, effective vaccines are available. That is not yet the case for West Nile Fever.