Water, sanitation and hygiene for the health of developing nations.

An article on water and sanitation needs of the poor in developing countries. To meet the target of water and sanitation for all by the end of 2025, some 2.9 billion people will have to receive improved water supplies, and 4.2billion improved sanitation. The technologies used must be appropriate, simple, affordable and sustainable. Public Health 2003;117:452-456.