The Bandim Health Project was initiated in 1978 with the aim of improving child survival in Guinea Bissau. The project is part of the National Institute of Health (INASA) in Guinea-Bissau and supported by a research group at the Statens Serum Institut, Copenhagen. The research station in Guinea-Bissau currently employs several Guinean physicians and epidemiologists involved in research training and a few expatriates, medical doctors, statistician, immunologist, medical and public health students. The field station registers the basic demographic and health-related data for approximately 102,000 inhabitants in the capital Bissau. In a similar sized population in 182 randomly selected clusters of villages, women and children are followed in the interior of Guinea-Bissau.