Table 2 Cluster household characteristics and transmission in the study population by epidemic period, from 2020 to 2023.
Characteristic | Pre-VoC, N = 1421 | Gamma/Delta, N = 511 | Omicron, N = 791 |
|---|---|---|---|
Cluster with transmission | 69 (49%) | 17 (33%) | 38 (48%) |
Median household cluster size (IQR) | 4 (2–10) | 4 (2–8) | 3 (2–9) |
Transmissions per cluster | 0.8 (0–5) | 0.5 (0–4) | 0.7 (0–5) |
Number of rooms | 6.4 (3–18) | 6.8 (2–16) | 7.0 (3–14) |
Persons per room | 0.6 (0.2–1.8) | 0.7 (0.3–1.6) | 0.6 (0.2–1.6) |
Children under 12 | 59 (42%) | 22 (43%) | 27 (34%) |
Adults over 60 | 56 (39%) | 19 (37%) | 28 (35%) |
Healthcare worker | 55 (39%) | 17 (33%) | 31 (39%) |
Average vaccine-induced immunity score2 | - | 0.6 (0-3.3) | 3.6 (1.3-5) |
Average infection-induced immunity score3 | - | 0.4 (0–2) | 0.5 (0-1.3) |
People with hybrid immunity within the cluster (%)4 | - | 0.5 (0–25) | 2.5 (0-66.7) |
