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Zika virus (ZIKV) infection during pregnancy is linked to severe birth defects, but mother-to-fetus transmission routes are unknown. We infected different primary cell types from mid- and late-gestation placentas and explants from first-trimester chorionic villi with the prototype Ugandan and a recently isolated Nicaraguan ZIKV strain. ZIKV infects primary human placental cells and explants—cytotrophoblasts,...