Science et changements planétaires / Sécheresse


Conséquences de la sécheresse sur la bilharziose dans le Nordeste brésilien Volume 3, issue 4, Décembre 1992

Centre Interdisciplinaire des Sciences de la Santé (CISS) 1, avenue Général-Niessel, 37200 Tours, France.
  • Page(s) : 235-42
  • Published in: 1992

Bilharzia is dependent upon many biological and social factors, especially human water requirements, resulting in its becoming a highly focalised disease. Being in a highly unstable equilibrium with the environment, it is very sensitive to climatic change. In the Brazilian Nordeste, however, cane monoculture and the social control of the local populations ensured a great stability of its distribution. The great drought of 1979-1983 disrupted this equilibrium. Human migration increased, allowing the endemia to spread; and a new but less efficient vector reduced its intensity in traditional areas. It also contributed towards reorganisation of the control programme, the indiscriminate efficiency of which masked realities out in the field and may even have jeopardised the future.