[Environment in the Third World].

The major health problems in developing countries are associated with poverty, lack of food, poor sanitation, hygiene and high population growth. Malaria and schistosomiasis have increased along with more frequent use of large scale irrigation schemes. During recent decades some countries have managed to control the communicable diseases. However, new health problems have developed, often as a result of environmental degradation and uncontrolled population growth. Urbanization and industrialization are closely related to, and often cause pollution, ecological imbalances and occupational health problems. Indoor air pollution is a neglected problem. Health workers in third world must identify problems and seek solutions by applying epidemiological principles. National and international cooperation are both needed to cope with the problems.