Harvard Pop Center affiliated faculty Kathleen Kahn and Stephen Tollman have co-authored a study that finds that in the Agincourt sub-district of northeast South Africa, temporary migration (migrants relocating mainly for work purposes and remaining linked to the rural household) is more important than age and gender in explaining variations in mortality, whatever the cause. The study suggests that public health policies should account for population mobility, and that the rural health care system should be strengthened, because migrants tend to return to rural households when they need health care.