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Mean concentration response (SMI%) lines of DBB for the years 1997 and 1998 for P. falciparum from Mae Hong Son (MHS) and Mae Sot (MS), with data points. Higher EC values from Mae Sot are indicated by the flatter regression line. The mean EC50 from Mae Sot in 1998 (MS 98) was found to be significantly higher than the corresponding value from Mae Hong Son (MHS 98).
