Abstract
An indirect immunofluorescence assay (IFA) was evaluated as a confirmatory test for antibody to human immunodeficiency virus type 1 in U.S. blood donor sera previously found to be repeatedly reactive by enzyme immunoassay. IFA results were 100% concordant with a licensed Western blot (immunoblot) for 53 negative and 49 positive samples. Four samples which exhibited antibody to viral proteins from more than one gene, yet were indeterminate by Western blot by the manufacturer's criteria, were also reactive by IFA, whereas 49 additional indeterminate samples were IFA negative.
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