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Combined detection of IgG, IgA and IgM enhances discrimination of infected and Pre19 groups. Serological responses from non‐hospitalized convalescents (NHC, n = 20) or pre‐2019 donors (Pre19, n = 4) as determined by ELISA using HRP‐labelled (a) anti‐IgG, (b) IgA and (c) IgM or (d) combined GAM, against 0·1 µg purified viral spike protein (S)
