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Seasonal trend of number of malaria cases in (A) Western Province, southern coastal region, (B) National Capital District, southern coastal region, (C) Eastern Highland Province, highland region, (D) East Sepik Province, northern coastal region, and (E) Madang Province, northern coastal region, during 1996-2008. X-axis: month, Y-axis: left, mean malaria incidence per 100000/mo (outpatients), right, rainfall (mm/mo).
