Figure 2. Comparison of ELISA reactivity of Sudanese sera against rK39, rK28, rK26 and rK9 proteins.

Antigen specific antibody titers of individual Sudanese human sera grouped based on their clinical status. Results are expressed as the optical densities at 450 nm (A₄₅₀). The antigens were coated at 0.25 µg/ml. A: rK39, B: rK28, C: rK26, D: rK9. The cut off values chosen from the ROC curves are shown as lines and are 0.304, 0.415, 0.315, and 0.159 for rK39, rK28, rK26 and rK9 ELISA respectively.