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Prevalence of malaria attack (i.e.fever + asexualPlasmodiumsp.) in schoolchildren in the communes of Ankadinondry-Sakay (red line), Mahasolo (blue line), and Maroharona (green dashed line). Indoor residual spray (IRS) with DDT and pyrethroids were performed in February 2003 and February 2004, respectively; the Maroharona commune remained untreated.
