Because of Nairobi’s high altitude, residents are not subject to such a high risk of many of the tropical diseases that afflict other African cities. However, outbreaks of cholera, typhoid and other bacterial infections are not uncommon here, particularly in the overcrowded slum areas, where water and sanitation infrastructure are poor or non-existent and diseases often flourish as a result.However, the altitude does have some setbacks:it can make people feel excessively tired when they arrive (a phenomenon that usually wears off after 2-3 weeks), and Nairobi’s location near the equator also increases the risk of sunburn, particularly for those with pale or sensitive skin.The use of hats and sunscreen is recommended, particularly for young children. Foods should be well cooked, and salads washed thoroughly in boiled water. News of the latest health threats and regularly updated travel health advisories can be obtained from the UN Medical Service.