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The WHO Guide to sanitation in natural disasters (Assar, 1971) summarized the essential aspects of environmental health management in disasters. These included the provision of emergency water and sanitation services; the burial or cremation of the dead; vector and pest control; food hygiene; and the assessment of the danger of epidemics following emergencies and disasters, etc. Thirty years later these aspects remain essential, though the needs, challenges and opportunities are greater. The present book deals not only with emergency response, but also with measures designed to reduce the impact of disasters on environmental health infrastructure, such as water supply and sanitation facilities. It also aims to strengthen the ability of people to withstand the disruption of their accustomed infrastructure and systems for environmental health (e.g. shelter, water supply, sanitation, vector control etc.) and to recover rapidly.

Infectious diseases take a heavy toll on populations around the world. Some of the most virulent infections are also highly sensitive to climate conditions. For example, temperature, precipitation and humidity have a strong influence on the reproduction, survival and biting rates of the mosquitoes that transmit malaria and dengue fever, and temperature affects the lifecycles of the infectious agents themselves. The same meteorological factors also influence the transmission of water and food-borne diseases such as cholera, and other forms of diarrhoeal disease. Hot, dry conditions favour meningococcal meningitis – a major cause of disease across much of Africa. All of these diseases are major health problems. Diarrhoea kills over two million people annually, and malaria almost one million. Meningitis kills thousands, blights lives and hampers economic development in the poorest countries. Some 50 million people around the world suffer from dengue fever each year. The public health community has made important progress against all of these diseases in recent decades, but they will continue to cause death and suffering for the foreseeable future.