Influence of CD40 MAb treatment on the expression of various molecules on M. leprae-infected DCs. Immature DCs obtained from healthy donors were infected with M. leprae (MOI, 40) and were further treated with control Ab or MAb to CD40, followed by anti-mouse IgG Ab. The surface expression of various molecules on both DCs was determined. Dashed lines, control MAb; solid lines, indicated MAb. The assay was done in triplicate, and the mean fluorescence intensity ± standard deviation of the mean is shown. A representative of three independent experiments is shown.