Fig. 1

ADE of infection of U937 cells with high and low passage DENVs. Antibody–virus complexes were generated with a DENV 4 LAB, b DENV 4 DF and c DENV 4 DHF and different dilutions of HB 114 antibodies before incubation with U937 cells and subsequent culture for 1–5 days post infection. The degree of infection was determined by flow cytometry. Experiment was undertaken independently in triplicate and error bars show SEM