RESUMO
A descriptive, cross-sectional and analytical study was carried out in 3 areas of the Gaza Strip, Palestine, in 2002, to determine the factors associated with high methaemoglobin [Met-Hb] levels in infants and the relationship with nitrate concentration in drinking water wells. Drinking water sources were likely to be the main factor for high levels of Met-Hb. Out of 338 infants attending for vaccination, having supplemental feeding, use of boiled water and age 3-6 months were associated with high Met-Hb levels. The highest mean Met-Hb level was in Khan-Younis, where the highest mean nitrate concentration was recorded in drinking water. The results emphasize the importance of exclusive breastfeeding for infants < 6 months old, and the choice of a suitable source of water for these infants