Table 1.

Specimens selected in this study for their potential to contain cross-reactive antibodies, where time elapsed refers to the time between PCR detection of the virus (CR1–27) or other potentially interfering substance (CR28–31) and collection of the blood specimen used in this study.

Sample ID	Interfering substance	Time elapsed (d)
CR01	History of coronavirus HKU1 infection	28
CR02	History of coronavirus HKU1 infection	46
CR03	History of coronavirus HKU1 infection	74
CR04	History of coronavirus HKU1 infection	82
CR05	History of coronavirus HKU1 infection	84
CR06	History of coronavirus HKU1 infection	85
CR07	History of coronavirus HKU1 infection	96
CR08	History of coronavirus HKU1 infection	108
CR09	History of coronavirus HKU1 infection	108
CR10	History of coronavirus HKU1 infection	116
CR11	History of coronavirus HKU1 infection	120
CR12	History of coronavirus HKU1 infection	127
CR13	History of coronavirus HKU1 infection	146
CR14	History of coronavirus NL63 infection	1
CR15	History of coronavirus NL63 infection	19
CR16	History of coronavirus NL63 infection	53
CR17	History of coronavirus NL63 infection	411
CR18	History of coronavirus NL63 infection	452
CR19	History of coronavirus NL63 infection	530
CR20	History of coronavirus OC43 infection	103
CR21	History of coronavirus OC43 infection	241
CR22	History of coronavirus OC43 infection	370
CR23	History of coronavirus OC43 infection	440
CR24	History of coronavirus OC43 infection	863
CR25	History of coronavirus OC43 infection	1159
CR26	History of coronavirus 229E infection	118
CR27	History of coronavirus 229E infection	448
CR28	Rheumatoid result of 63	0
CR29	Rheumatoid result of 27	0
CR30	HSV2 Ab, HCV Ab	0
CR31	HIV-1 Ab, HAV total, HBc total, HBsAb, RPR(1:4)	0