Fig 4. Antibody titers to Hcp1 antigen (A) and OPS antigen (B) in melioidosis patients with bacteremia and non-bacteremia patients.

ELISAs were performed on the plates coated with antigens using undiluted sera and two-fold serially diluted sera from patients. Box plots represent 25^th and 75^th percentile boundaries in the box with the median line within the box; the whiskers indicate the 10^th and 90^th percentiles. The plots show antibody titers for each group of patients. The antibody titer was determined by ELISA using cut-off titers at specificity of 95%.