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Avidity ELISA of CuMVTT-RBDwt immunized mice sera to all RBDs at d14 (A) and d49 (B). IgG titers with (red symbols) and without (black symbols) 7M urea wash were displayed. Statistical significance was analyzed using unpaired t-test, p values: ≤0.05 (*), ≤0.01 (**), ≤0.001 (***), ≤0.0001 (****).
