Table 4.

Minimum Ct values of Delta and Omicron variant infections stratified by age group and vaccination status.

		Delta variant				Omicron variant
Age group (years)	Target	Primary vaccination ≥180 days median (IQR), N	Primary vaccination <180 days median (IQR), N	Booster dose median (IQR), N	p value	Primary vaccination ≥180 days median (IQR), N	Primary vaccination <180 days median (IQR), N	Booster dose median (IQR), N	p value
3–17	ORF1ab	-	24.0 [20.5;26.1]47	-	.	-	23.0 [22.0;25.0]33	-	.
	N	-	22.4 [18.5;25.0]47	-	.	-	23.0 [21.0;25.0]33	-	.
18–49	ORF1ab	22.0 [20.0;26.0]59	22.0 [19.8;25.0]52	24.0 [22.0;28.0]29	0.075	23.5 [22.2;27.0]6	23.0 [20.5;25.0]23	23.0 [23.0;23.0]1	0.690
	N	21.0 [18.0;25.0]59	21.0 [19.0;23.2]52	22.0 [20.0;26.0]29	0.298	24.0 [23.0;28.0]6	22.0 [20.0;25.0]23	24.0 [24.0;24.0]1	0.397
≥50	ORF1ab	21.0 [18.5;25.1]51	21.0 [18.0;23.9]95	21.8 [18.5;25.0]23	0.637	23.0 [22.0;25.0]5	26.5 [24.8;28.2]2	-	0.558
	N	20.0 [17.0;23.1]51	20.0 [17.0;22.1]95	22.0 [17.2;23.0]23	0.721	23.0 [22.0;24.0]5	26.0 [25.5;26.5]2	-	0.245
All	ORF1ab	21.7 [19.0;26.0]110	22.0 [19.0;24.1]194	23.7 [19.8;26.1]52	0.124	23.0 [22.0;26.5]11	23.0 [22.0;25.0]58	23.0 [23.0;23.0]1	0.873
	N	20.9 [18.0;24.3]110	21.0 [18.0;23.0]194	22.0 [18.0;24.2]52	0.452	23.0 [22.5;27.0]11	23.0 [21.0;25.0]58	24.0 [24.0;24.0]1	0.558