Characteristics of 26 clusters with evidence of school-based transmission
| Characteristic | No. (%)* | |||
|---|---|---|---|---|
| Grades K–7 n = 13 clusters | Grades 8–12 n = 9 clusters | Staff only n = 4 clusters | All grades n = 26 clusters | |
| No. of cases per cluster, median (range) | 2 (2–8) | 3 (2–4) | 2.5 (2–4) | 2.5 (2–8) |
| Role of index cases, n = 26 cases | ||||
| Staff | 7 (53.8) | 3 (33) | 4 (100) | 14 (54) |
| Student | 6 (46.2) | 6 (67) | 0 (0) | 12 (46) |
| Role of secondary cases, n = 55 cases | ||||
| Staff | 4 (12.1) | 3 (20.0) | 7 (100) | 14 (25.5) |
| Student | 29 (87.9) | 12 (80.0) | 0 (0) | 41 (74.5) |
Note: K = kindergarten.
↵* Unless stated otherwise. Percentage reflects the proportion of cases per grade grouping or staff status.