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| Study population | No. | Gender | Median age, years (range) | Health status | Antibiotic therapy | Use of face mask |
|---|---|---|---|---|---|---|
| Pig farm workers | 16 | 2 women | 32.5 (21–54) | Healthy (n = 16) | No (n = 16) | No (n = 16) |
| 14 men | Yes (n = 0) | Yes (n = 0) | ||||
| Volunteers | 8 | 7 women | 25.5 (22–44) | Healthy (n = 8) | No (n = 8) | No (n = 8) |
| 1 man | Yes (n = 0) | Yes (n = 0) |
