Table 2.
Containment delays and epidemiological profiles of primary contacts, primary cases and secondary cases resulting from the VN54 cluster.
| Time interval | Primary contactsa (N = 183) | Primary cases (N = 15) | Secondary cases (N = 5) |
|---|---|---|---|
| Index case confirmation to isolation/quarantine (median, IQR) (days) | 2.0 (1.0–3.0) | 3.0 (2.5–3.0) | 2.0 (2.0–5.1) |
| Last exposure to isolation/quarantine (median, IQR) (days) | 5.8 (4.8–6.8) | 6.8 (6.3–6.8) | 5.8 (5.8–7.0) |
| Last exposure to symptom onset (median, IQR) (days) | – | 10.8 (6.6–15.1) | 4.8 (4.0–4.8) |
| Cumulative duration of community exposure (person-days) | – | 84.0 | 26.4 |
| Cumulative duration of symptomatic community exposure (person-days) | – | 4.0 | 7.0 |
| Case categories (n, %) | |||
| Symptomatic | – | 3 (20) | 4 (80) |
| Pre-symptomatic | – | 7 (47) | 1 (20) |
| Asymptomatic | – | 5 (33) | 0 |
Note: Data for secondary contacts were not available.
a
All flight passengers and staff who were still in Vietnam at time of contact tracing initiation.