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The proportion of S‐RBD‐specific IgG antibody titers. (A) The proportion of S‐RBD‐specific IgG antibody titers in 49 donors. (B) The proportion of S‐RBD‐specific IgG antibody titers in 30 donors with a fever lasting longer than 3 days or body temperatures exceeding 38.5°C at disease presentation and with more than 4 weeks after symptoms. [Color figure can be viewed at wileyonlinelibrary.com]
