Table 1 N-specific antibody testing results by serology assay type among HCW participants at the 2022 health physical (n = 2538)a.
Total | Roche Elecsys Anti-SARS-CoV-2 | Abbott Alinity SARS-CoV-2 IgG | ||||||
|---|---|---|---|---|---|---|---|---|
n | % | Negative n (%) | Positive n (%) | Negative n (%) | Grayzone n (%) | Positive n (%) | Grayzone/Positive n (%) | |
Overall | 2538 | (100.0) | 2118 (83.5) | 420 (16.6) | 2211 (87.1) | 136 (5.4) | 191 (7.5) | 327 (12.9) |
Age | ||||||||
20–29 | 597 | (23.5) | 462 (77.4) | 135 (22.6) | 494 (82.7) | 37 (6.2) | 66 (11.1) | 103 (17.3) |
30–39 | 747 | (29.4) | 615 (82.3) | 132 (17.7) | 640 (85.7) | 47 (6.3) | 60 (8.0) | 107 (14.3) |
40–49 | 638 | (25.1) | 532 (83.4) | 106 (16.6) | 555 (87.0) | 38 (6.0) | 45 (7.1) | 83 (13.0) |
50–59 | 355 | (14.0) | 316 (89.0) | 39 (11.0) | 329 (92.7) | 10 (2.8) | 16 (4.5) | 26 (7.3) |
60–69 | 164 | (6.5) | 158 (96.3) | 6 (3.7) | 257 (95.7) | 4 (2.4) | 3 (1.8) | 7 (4.3) |
70 or older | 37 | (1.5) | 35 (94.6) | 2 (5.4) | 36 (97.3) | 0 (0.0) | 1 (2.7) | 1 (2.7) |
Sex | ||||||||
Male | 907 | (35.7) | 754 (83.1) | 153 (16.9) | 788 (86.9) | 47 (5.2) | 72 (7.9) | 119 (13.1) |
Female | 1631 | (64.3) | 1364 (83.6) | 267 (16.4) | 1423 (87.2) | 89 (5.5) | 119 (7.3) | 208 (12.8) |
Profession | ||||||||
Doctor | 748 | (29.5) | 612 (81.8) | 136 (18.2) | 638 (85.3) | 46 (6.1) | 64 (8.6) | 110 (14.7) |
Nurse | 820 | (32.3) | 650 (79.3) | 170 (20.7) | 696 (84.9) | 51 (6.2) | 73 (8.9) | 124 (15.1) |
Paramedical staffb | 399 | (15.7) | 360 (90.2) | 39 (9.8) | 366 (91.7) | 13 (3.3) | 20 (5.0) | 33 (8.3) |
Administration staff | 391 | (15.4) | 336 (85.9) | 55 (14.1) | 349 (89.3) | 17 (4.3) | 25 (6.4) | 42 (10.7) |
Other | 180 | (7.1) | 160 (88.9) | 20 (11.1) | 162 (90.0) | 9 (5.0) | 9 (5.0) | 18 (10.0) |
Close contacts with COVID-19 patients | ||||||||
No | 1929 | (76.0) | 1630 (84.5) | 299 (15.5) | 1698 (88.0) | 106 (5.5) | 125 (6.5) | 231 (12.0) |
Yes | 609 | (24.0) | 488 (80.1) | 121 (19.9) | 513 (84.2) | 30 (4.9) | 66 (10.8) | 96 (15.8) |
No. of vaccine doses received (mRNA vaccines) | ||||||||
0 dose | 54 | (2.1) | 45 (83.3) | 9 (16.7) | 47 (87.0) | 2 (3.7) | 5 (9.3) | 7 (13.0) |
1 dose | 9 | (0.4) | 7 (77.8) | 2 (22.2) | 7 (77.8) | 0 (0.0) | 2 (22.2) | 2 (22.2) |
2 doses | 144 | (5.7) | 110 (76.4) | 34 (23.6) | 113 (78.5) | 14 (9.7) | 17 (11.8) | 31 (21.5) |
3 doses | 2115 | (83.3) | 1749 (82.7) | 366 (17.3) | 1837 (86.9) | 115 (5.4) | 163 (7.7) | 278 (13.1) |
4 doses | 216 | (8.5) | 207 (95.8) | 9 (4.2) | 207 (87.1) | 136 (5.4) | 191 (7.5) | 327 (12.9) |
PCR-confirmed COVID-19 infection? | ||||||||
Yes | 219 | (8.6) | 6 (2.7) | 213 (97.3) | 52 (23.7) | 59 (26.9) | 108 (49.3) | 167 (76.3) |
No | 2319 | (91.4) | 2112 (91.1) | 207 (8.9) | 2159 (93.1) | 77 (3.3) | 86 (3.6) | 160 (6.9) |
