Serial dilutions of anti-DENV2 IgY were mixed with DENV2 D2S10 and used to infect DENV-permissive monocytic U937 DC-SIGN cells (neutralization) or an erythroleukemic cell line, K562 (enhancement), which are not naturally permissive for DENV infection, but can be infected via surface FcγRIIA when DENV virions are coated with sub-neutralizing concentrations of anti-DENV antibody. The gene discussed is CD209; the disease is infection.