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Performance of the Liaison® XL Murex recHTLV-I/II Immunoassay in the Detection of HTLV-1/2 Antibodies in Serum by Pierre Gantner, Aurelie Velay, Nicolas Guigue, Heidi Barth, Marie-Josee Wendling, Constance Delaugerre, Samira Fafi-Kremer

Background: Human T-cell lymphotropic virus type 1 and 2 (HTLV-1/2) immunoassays are used for blood screen- ing from blood products, milk, and organ donors.
Methods: We assessed the performance of the DiaSorin Liaison® XL murex recHTLV-I/II immunoassay relative to the Abbott Architect® rHTLV-I/II immunoassay and with the Innogenetics immunoblot as confirmation.
Results: A panel of HTLV positive (n = 66) and negative (n = 30) sera was tested in both techniques within the same freeze/thaw cycle. The specificity and sensitivity of DiaSorin immunoassay were 100% and 78.8%, respectively. Abbott and DiaSorin immunoassays showed a correlation in chemiluminiscent signals to cutoff (S/CO) (Pearson r = 0.92). Half of the samples (34/66) from the seropositive panel were not confirmed by immunoblot (S/CO < 5 in both techniques).
Conclusions: Our data confirmed that the DiaSorin Liaison® XL murex recHTLV-I/II immunoassay is an effective platform for HTLV screening. Due to false-positive reaction, especially for samples with low S/CO, each seropositive sample should be confirmed by immunoblot.

DOI: 10.7754/Clin.Lab.2017.161026