Figure 2. Comparison of antibody-dependent cellular phagocytosis (ADCP) activity between 82 survivors and 38 nonsurvivors of acute melioidosis, Thailand. ADCP activity was tested by using U937 (A) and THP-1 (B) human monocytic cell lines. Heat-inactivated serum samples were incubated with live fluorescein isothiocyanate–labeling Burkholderia pseudomallei before transfer to the cells, and the percentage of B. pseudomallei uptake by cells was analyzed by flow cytometer. We used the Mann-Whitney U test for statistical comparison.