Table 2.

Analysis of humoral immunity against SARS-CoV-2 at 6-week and 6-month follow-up (all participants non-vaccinated) as well as at 12-month follow-up grouped between vaccinated and non-vaccinated participants. Results are given as median values (range): Nab, neutralizing antibodies; *, at least 14 days before 12 months follow-up visit; p1 value, 6-week vs. 6-month; p2 value, vaccinated * vs. non-vaccinated at 12-months visit.

Assay	6-Week Visit (n = 83)	6-Month Visit (n = 83)	p1 Value	12-Month Visit (Non-Vaccinated, n = 77)	12-Month Visit (Vaccinated *, n = 5)	p2 Value
IgA value	3.38 (0.8–11.0)	1.80 (0.4–9.0)	<0.001	1.9 (0.5–20.3)	22.3 (10.3–22.3)	<0.001
IgG value	3.65 (0.5–15.8)	1.80 (0.2–7.5)	<0.001	1.7 (0.6–10.6)	35.0 (13.1–40.8)	<0.001
Nab titer	1:5 (1:1–1:640)	not done		1:1 (1:1–1:40)	1:320 (1:160–1:320)	<0.001