Malaria often occurs in specific local geographic areas.
These areas do not respect political or jurisdictional boundaries. Communication problems hamper this coordination. Malaria control is different from the control of many other diseases because malaria transmission is dependent on mosquito populations. During these same years, there has been a marked increase in malaria incidence in many regions of South America and Asia, with some increase in Africa as well. Certain aspects of malaria control, such as distribution of mosquito fish or impregnated bednets for mosquito control, or residual spraying efforts, are not closely related to the normal duties of Primary Health Care Centres.