Fig. 2

Performance evaluation of HTLV-1 diagnostic serological assay kits available in Japan on samples with indeterminate WB results. To further evaluate the performances of the HTLV-1 diagnostic serological assay kits commercially available in Japan, primary detection-reactive and WB-indeterminate samples from 50 blood donors and 67 pregnant women were tested with the same 10 assay kits used in the experiment for Fig. 1, according to the manufacturers' instructions. The results for each kit used are shown in Additional file 1: Figure S1. Herein, summary of the number of samples obtained and scored by kits I and J (WB and LIA, respectively) is exhibited. The performances of each of these kits were compared to determine their utility as confirmatory tests (left panel: blood donors, right panel: pregnant women). P: positive, N: negative, and I: indeterminate