Impact of ChAdOx1 nCoV-19 (Covishield™) Vaccination: How Long Will It Persist?

Table 1

Detection of SARS-CoV-2 IgG antibodies among healthcare workers at various sampling points.

Antibody index range	Sampling point for SARS-CoV-2 IgG antibody detection						Statistical analysis
	Prior to 1^st dose		Prior to 2^nd dose		3 months after 2^nd dose
	N (%)	Mean ± SD	N (%)	Mean ± SD	N (%)	Mean ± SD
1.1–5	25 (59.5)	2.2 ± 0.8	52 (43.3)	2.9 ± 0.9	35 (25.2)	3.3 ± 1.1	<0.001
5.1–10	8 (19)	6.9 ± 1.3	45 (37.5)	7.1 ± 1.5	69 (49.6)	8.1 ± 2	0.02
10.1–16	9 (21.5)	9.4 ± 3.6	23 (19.2)	12.4 ± 3.3	35 (25.2)	12.8 ± 1.8	0.004

was considered statistically significant.