In "Determination of Cytochrome P450 Isoenzyme 2D6 (CYP2D6) Genotypes and Pharmacogenomic Impact on Primaquine Metabolism in an Active-Duty US Military Population" by Spring et al. [J Infect Dis 2019:220 (1 December); DOI: 10.1093/infdis/jiz386] the panels in Figure 2 are mislabeled in the figure legend. The correct Figure 2 legend should read: Pharmacokinetic profiles in plasma (A and C) and urine (B and D, dotted lines) specimens from volunteers with the normal metabolizer (NM) phenotype (circles; n = 8), the intermediate metabolizer (IM) phenotype (triangles; n = 20), and the poor metabolizer (PM) phenotype (squares; n = 16) for primaquine (PQ; A and B) and carboxyprimaquine (cPQ; C and D) at scheduled time points after administration of 30 mg of PQ orally. Data are median values. The authors regret the error.