Table 1.

Viral detections, demographic characteristic and risk factors in pre-COVID-19 seasons and 2020/2021.

	Pre-COVID-19 seasons (n = 162)		COVID-19 season (n = 16)
	Number of measurements	n (%)	Number of measurements	n (%)	P-value
Demographics
Female	162	79 (49)	16	5 (31)	0.18
Male	162	83 (51)	16	11 (69)	0.18
Age in months, median (IQR)	162	4.3 (2–10)	16	11.8 (3–16)	0.04
Risk factors
Comorbidity	162	30 (18)	16	7 (44)	0.01
Prematurity	162	39 (24)	16	4 (25)	1
Exclusively formula milk	152	63 (41)	9	2 (22)	0.31
Passive smoking	137	42 (31)	4	0 (0)	0.32
Older siblings	147	117 (80)	16	10 (62)	0.12
Day-care attendante	153	16 (10)	15	3 (20)	0.38
Nasopharyngeal aspirate
Negative	162	5 (3)	16	2 (12.5)	0.12
Positive	162	157 (97)	16	14 (87.5)	0.12
Single-detections	162	102 (63)	16	8 (50)	0.57
Co-detections	162	55 (34)	16	6 (37.5)	0.57
Negative	162	5 (3)	16	2 (12.5)	0.12