Comparison of quantitative results obtained with the Enzygnost antiVZV/IgG, Serion ELISA Classic VZV IgG, and Euroimmun anti-VZV ELISA (IgG) tests for positive sera from blood donors of panel 2. Comparison of quantitative results obtained with the Enzygnost antiVZV/IgG, Serion ELISA Classic VZV IgG, and Euroimmun anti-VZV ELISA (IgG) tests for positive sera from blood donors of panel 2. A total of 357 sera within the upper quantification limit of 2,000 mIU/ml for the Serion ELISA Classic VZV IgG were included. Correlation was analyzed statistically by Passing-Bablok regression. Andreas Sauerbrei et al. Clin. Vaccine Immunol. 2012; doi:10.1128/CVI.00183-12