Strata specific samples for study sites
| Staff category | Nelson Mandela Academic Hospital | Witbank Hospital | Pietersburg Hospital | Robert Mangaliso Sobukwe Hospital |
| Medical doctors | 86 | 57 | 78 | 55 |
| Nursing staff: | ||||
| Professional nurse | 117 | 73 | 83 | 75 |
| Enrolled nurse | 25 | 16 | 19 | 17 |
| Enrolled nursing assistant | 75 | 26 | 36 | 25 |
| Total | 303 | 172 | 216 | 172 |