The manufacturers' instructions should be followed. Few published reports in the scientific literature have evaluated the efficacy of specific brands or models of filters against bacteria and viruses in water. Until such information becomes available, CDC cannot identify which specific brands or models of filters are most likely to remove bacteria and viruses. A list of filters that have passed NSF tests for parasite removal is available at the NSF International Web site . To avoid illness, food should be selected with care.
All raw food is subject to contamination.
Particularly in areas where hygiene and sanitation are inadequate, the traveler should be advised to avoid salads, uncooked vegetables, and unpasteurized milk and milk products such as cheese, and to eat only food that has been cooked and is still hot, or fruit that has been peeled by the traveler. Undercooked and raw meat, fish, and shellfish may carry various intestinal pathogens. Cooked food that has been allowed to stand for several hours at ambient temperature may provide a fertile medium for bacterial growth and should be thoroughly reheated before serving. Consumption of food and beverages obtained from street food vendors has been associated with increased risk of illness. The easiest way to guarantee a safe food source for an infant younger than 6 months is to breast-feed the child .