TABLE 3.

Concomitant detection of IgA antibodies to one or more strains of HCoV in nasal wash specimens

Nasal wash specimen with detectable IgA antibodies to the HCoV strain (no. positive)	No. (%) of nasal wash specimens with concomitantly detectable IgA antibodies to another HCoV strain
	Group I		Group II
	HCoV-229E	HCoV-NL63	HCoV-OC43	HCoV-HKU1
Group I
HCoV-229E (12)		4 (33)	7 (58)	4 (33)
HCoV-NL63 (8)	4 (50)		6 (75)	5 (63)
Group II
HCoV-OC43 (22)	7 (32)	6 (27)		12 (55)
HCoV-HKU1 (31)	4 (13)	5 (16)	12 (39)