Malaria risk, almost exclusively in the malignant falciparum form, exists throughout the year, but mainly from September through February, in the whole country excluding Aden and the airport perimeter. Resistance to chloroquine has been reported. Chloroquine plus proguanil is recommended.
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. Water used for drinking, brushing teeth or making ice should have first been boiled or otherwise sterilised. Milk is unpasteurised and should be boiled. Avoid dairy products that are likely to have been made from unboiled milk. Only eat well-cooked meat and fish, preferably served hot.