Extent of direct and indirect contact history
| Level of contact | Proportion of respondents (%) |
|---|---|
| Close contact with a confirmed case | 0.1 |
| Non-close contact with a confirmed case | 0.9 |
| Indirect contact with a confirmed case (“contact of direct contact”) | 2.7 |
| Suspected contact with a case (confirmed or unconfirmed) or infected materials | 9.0 |
| No contact history | 87.3 |