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Principal component analysis of P. vivax isolates obtained from asymptomatic and symptomatic populations with variables of four drug resistance-related genes (pvmdr1, pvcrt-o, pvdhfr and pvdhps). Twenty-three parasites from each group were used in the analysis. Since some parasites have identical haplotypes, their spots overlapped in the PCA plot. The two types of P. vivax population are circled
