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A: Comparison of anti-HCV initial screen & mean re-test OD/CO values. A new disc was punched eluted and tested in duplicate when the initial eluate gave an OD in the range 0.080 – 2.500 (n = 53). B: Comparison of duplicate anti-HCV OD/CO values on new eluates from DBS whose initial screen OD was in the range 0.080 – 2.500 (n = 53).
