b Four specimens were depleted prior to the finishing of testing against all viral antigens. c There was significant nonagreement between antibody pairs against HCoV-229E and HCoV-HKU1, between HCoV-NL63 and HCoV-HKU1, and between HCoV-0C43 and HCoV-HKU1 (P ϭ 0.011, P ϭ 0.035, and P ϭ 0.004, respectively, by McNemar's test).