| Domain | Sub domain | Correct response n (%) |
| Total knowledge among ever heard (n = 561) | Causes | 433 (70.3) |
| Occupational risk groups | 418 (67.9) | |
| Mode of transmissions | 277 (45.0) | |
| Symptoms | 228 (37.1) | |
| Complications | 120 (19.4) | |
| Risk factors | 236 (38.2) | |
| Prevention | 250 (40.6) | |
| Total attitude (n = 616) | Positive attitude (off work) | 542 (87.9) |
| Positive attitude at workplace | 499 (80.9) | |
| Total practice (n = 616) | Safe work practice | 356 (57.9) |
| General practice (off work) | 490 (79.5) |