Despite the fanfare surrounding pledges to halve the number of malaria deaths over the next decade, the truth is that scientists have little idea how many people get sick or die from malaria, or where, let alone whether control efforts are working. Researchers lack data to evaluate accurately the impact of interventions such as drugs or insecticide-impregnated bednets. The international community must address this deficiency if it is to improve control strategies and measure their progress.
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