e The GMT against HCoV-OC43 was greater than the GMTs against HCoV-NL63 and HCoV-KHU1 (P Ͻ 0.0001 by Wilcoxon signed-rank test). f There was significant nonagreement between antibody pairs against HCoV-229E and HCoV-OC43 and between antibody pairs against HCoV-229E and HCoV-HKU1 (P ϭ 0.03 and P ϭ 0.0013, respectively, by McNemar's test).