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Questionnaire to examine participants' level of knowledge of COVID-19.
| Knowledge | Accuracy (%) |
| 1. Washing your hands and wearing a mask frequently could help to prevent COVID-19. | 98.3 |
| 2. When people with COVID-19 sneeze or cough around you, is it easier to be infected? | 97.0 |
| 3. Eating a lot of garlic could help to prevent COVID-19. | 83.1 |
| 4. Improving your immunity could help you fight COVID-19. | 95.5 |
| 5. If infected, older adults have the highest risk of mortality. | 88.8 |
