Table 2.

HCoV-NL63 analysis on PRI.DE samples.

Month of sampling	PRI.DE samples collected	HCoV-NL63 study patients (% of PRI.DE study)	Nr (%) of samples positive for HCoV-NL63
November 1999	162	69 (43%)	1 (1.4%)
December 1999	213	90 (42%)	1 (1.1%)
January 2000	307	130 (42%)	3 (2.3%)
February 2000	292	139 (47%)	3 (2.2%)
March 2000	347	156 (45%)	0 (0%)
April 2000	151	73 (48%)	2 (2.7%)
May 2000	83	41 (49%)	0 (0%)
June 2000	36	15 (42%)	0 (0%)
July 2000	28	13 (46%)	0 (0%)
August 2000	44	20 (45%)	0 (0%)
September 2000	82	40 (49%)	0 (0%)
October 2000	103	51 (50%)	0 (0%)
November 2000	215	108 (50%)	9 (8.3%)
December 2000	279	134 (48%)	18 (13.4%)
January 2001	344	171 (49%)	12 (7.0%)
February 2001	227	114 (50%)	13 (11.4%)
March 2001	205	107 (52%)	4 (3.7%)
April 2001	148	75 (51%)	0 (0%)
May 2001	95	41 (43%)	1 (2.4%)
June 2001	65	31 (48%)	0 (0%)
July 2001	45	24 (53%)	0 (0%)
August 2001	22	11 (50%)	0 (0%)
September 2001	73	35 (48%)	1 (2.9%)
October 2001	111	68 (61%)	1 (1.5%)