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Map showing (A) the location of Botswana within Africa, (B) the malaria endemic sub-districts and the study site in Botswana, and (C) surveyed villages of the Central district; Serowe, Palapye and Bobirwa sub-districts. 1 = Okavango, 2 = Ngamiland, 3 = Chobe, 4 = Tutume, 5 = Boteti, 6 = Bobirwa.
