Table 2.
Unweighted totals and weighted SARS-CoV-2 spike protein (S) and nucleocapsid (N) antibody positivity in unvaccinated primary school children and by COVID-19 vaccination status in secondary school children during Round 1 (10 November–10 December 2021) in the SIS2 study.
| Primary |
Secondary |
|||||||
|---|---|---|---|---|---|---|---|---|
| Total |
Total |
Vaccinated |
Unvaccinated |
|||||
| n* (%*) | Weighted (% (95% CI))† | n* (%) | Weighted (% (95% CI))† | n* (%) | Weighted (% (95% CI))† | n* (%) | Weighted (% (95% CI))† | |
| Negative | 1782 (65.9) | - | 620 (27.3) | - | 35 (3.5) | - | 585 (46.0) | - |
| Total Positive | 924 (34.1) | 40.1 (37.3–43.0) | 1654 (72.7) | 82.4 (79.5–85.1) | 968 (96.5) | 97.5 (96.1–98.5) | 686 (54.0) | 71.5 (65.7–76.8) |
| S positive / N positive | 627 (23.1) | 26.7 (24.2–29.3) | 690 (30.3) | 30.7 (27.4–34.1) | 276 (27.5) | 23.2 (19.3–27.4) | 414 (32.6) | 40.4 (34.5–46.5) |
| S positive / N negative | 205 (7.6) | 8.3 (6.8–10.0) | 888 (39.0) | 46.9 (43.3–50.5) | 692 (69.0) | 74.3 (70.0–78.4) | 196 (15.4) | 23.5 (18.6–29.0) |
| S negative / N positive | 92 (3.4) | 2.5 (1.7–3.6) | 76 (3.3) | 3.0 (1.9–4.5) | 0 (0.0) | 0.0 (0.0–0.8) | 76 (6.0) | 5.2 (2.9–8.6) |
| Unweighted total | 2706 | 2274 | 1003 | 1271 | ||||
Secondary total is the combined result of vaccinated and unvaccinated students whereas the primary school cohort only includes unvaccinated students therefore is presented as the total
*
n denotes the number of samples, percentages are unweighted and unadjusted.
†
Weighted by age, sex, ethnicity, and sampling design.