A yellow fever vaccination certificate is required from travellers coming from infected areas. See the Health appendix. Malaria risk, exclusively in the benign vivax form, exists along the northern border, especially in the southeast of the country, from May through October.
Bottled water is available and is advised for the first few weeks of the stay.
Drinking water outside main cities and towns is likely to be contaminated and sterilisation is considered essential. Milk is unpasteurised and should be boiled. Powdered or tinned milk is available and is advised but make sure that it is reconstituted with pure water. Only eat well-cooked meat and fish, preferably served hot. Vegetables should be cooked and fruit peeled.