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Numbers of serum samples in each study group that scored WB indeterminate or HTLV untypeable in previous analyses and HTLV infections confirmed or excluded by a Western blot (WB) assay (HTLV Blot 2.4; MP Biomedicals) and a line immunoassay (LIA) (INNO-LIA HTLV-I/II; Fujirebio). IND, indeterminate; NEG, negative.
