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Proportion of mutant Plasmodium falciparum dihydrofolate reductase and dihydropteroate synthetase haplotypes among pregnant women, Korogwe District, Tanga Region, Tanzania, September 2008–October 2010. Proportions are shown by gestational age; partial weeks are indicated by the number of days. Numbers above and below data points are the number of mutant haplotypes; total numbers (n) are shown below the graph.
