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USUV and WNV NT antibodies in serum of two of the 13 blood donors with cross-reacting antibodies. Kinetics of WNV and USUV neutralization titer in two donors with true positive USUV infection followed for several months (a,b) and in two donors with true positive WNV infection (c,d) followed for several months are reported. If available, in the box, WNV and USUV ELISpot assay and PCR analysis results are reported. * net spots/million peripheral blood mononuclear cells (PBMC).
