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Combination of different tests. Orange dots indicate positive neutralization results; blue dots indicate negative neutralization results. Combination of S1 and NC antigen (e.g.Generic Assay, n = 61) or different isotypes (Euroimmun IgG and IgA, n = 70) are shown as a possible approach to improve predictive value of testing strategy. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article.)
