Figure 1. Comparison of serum levels of Burkholderia pseudomallei–specific antibody subclasses between 94 survivors and 45 nonsurvivors of acute melioidosis, Thailand. A) IgM; B) total IgG; C) IgG1; D) IgG2; E) IgG3; and F) IgG4. Serum levels were tested by using indirect ELISA on heat-killed whole cell B. pseudomallei. We used Kruskal-Wallis 1-way ANOVA to compare >2 groups and Mann-Whitney U to compare 2 groups. Antibody levels in healthy endemic controls (n = 30) are shown for comparison for total IgM and IgG only. OD450, optical density at 450 nm.