TABLE 1.
Demographic characteristics with N‐Protein IgG and S‐Protein levels (First jab)
| Repeated negative RT‐PCR in the last 12 months (n = 735) | Positive RT‐PCR (n = 270) | p value | |||
|---|---|---|---|---|---|
|
Negative N‐Protein IgG a (n = 693) |
Positive N‐Protein IgG b (n = 42) |
9 to 12 months ago c (n = 94) |
3 to 7 months ago d (n = 176) |
||
| Sex | |||||
| Female (%) | 484 (69.8) | 35 (83.3) | 66 (70.2) | 139 (78.0) | 0.03 |
| Male (%) | 209 (30.2) | 7 (16.7) | 28 (29.8) | 37 (21.0) | |
| Age, mean (SD), range, year |
86.2 (0.0) 51–106 |
85.3 (7.0) 72–100 |
86.6 (9.2) 54–100 |
87.8 (8.2) 54–100 |
0.05 |
| SARS‐CoV−2 N‐Protein IgG level ≥0.8 signal to cutoff ratio, No. (%) | 0 | 42 (100) | 55 (61.1) | 144 (83.7) | <0.001 between c and d |
| SARS‐CoV−2 N‐Protein IgG level, median (IQR) [range], AU/ml | 0 |
3.4 (0.8;7.3), [0.8–7.3] |
1.0 (0.4;2.6) [0.02–6.1] |
3.91 (1.9;5.3) [0.01–8] | <0.001 between c and b , d |
| SARS‐CoV−2 S‐protein IgG level | |||||
| 0–50 AU/ml | 288 (41.7) | 5 (11.9) | 8 (4.6) | 2 (2.1) | |
| 50–1050 AU/ml | 343 (49.6) | 5 (11.9) | 15 (8.6) | 6 (6.4) | |
| 1050–4160 AU/ml | 47 (6.8) | 1 (2.4) | 5 (2.8) | 3 (3.2) | |
| ≥4160 AU/ml | 13 (1.9) | 31 (73.8) | 147 (84.0) | 83 (88.3) | |
| SARS‐CoV−2 S‐protein level median (Q1‐Q3) [range], AU/ml |
82 (16–296) [0–40,000] |
21,736 (16,229) [0–40,000] |
40,000 (9,146–40,000) [6–14142] | 20,796 (4157;40000) [1–40,000] | |
a
Corresponds to residents with negative RT‐PCR in the last 12 months and with negative N‐Protein IgG.
b
Corresponds to residents with negative RT‐PCR in the last 12 months and with positive N‐Protein IgG.
c
Corresponds to residents with posittive RT‐PCR in the last 9‐12 months.
d
Corresponds to residents with positive RT‐PCR in the 3 to 7 months ago.