Travelers' diarrhea can be caused by viruses, bacteria, or parasites, which are found throughout the region and can contaminate food or water. Make sure your food and drinking water are safe.
Malaria is a preventable infection that can be fatal if left untreated.
Malaria risk in this region exists all year in some cities and all rural areas of these countries, except for Brunei Darussalam and Singapore . Most travelers to Southeast Asia at risk for malaria should take mefloquine to prevent malaria. A certificate of yellow fever vaccination may be required for entry into certain of these countries if you are coming from a country in tropical South America or subSaharan Africa. Filariasis, Japanese encephalitis, and plague are diseases carried by insects that also occur in this region, but the risk to travelers is low. Because motor vehicle crashes are a leading cause of injury among travelers, walk and drive defensively.