Spread of Artemisinin Resistance in Plasmodium falciparum Malaria (Original Article, N Engl J Med 2014;371:411-423). In the Abstract (page 411), in the first sentence of Results, the median parasite clearance half-life in the Democratic Republic of Congo should have been 1.9, rather than 1.8. In the second paragraph of the Discussion (page 419), the third sentence should have read, “With one exception, only one SNP per propeller domain was ever present in `clonal' infections,” rather than “With two exceptions . . . .” The article is correct at NEJM.org.