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Use of depletion of human serum with DENV antigen to distinguish Zika virus–specific from cross-reactive flavivirus antibodies. A) Depletion efficiency was determined by direct ELISA. Plates were coated with depleting antigens (DENV-1 and DENV-2) and binding of control and depleted serum was measured. B–E) Binding of depleted serum to Zika virus H/PF/2013 was measured by capture ELISA. BSA, bovine serum albumin; DENV, dengue virus; OD, optical density.
