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| Population | % inhibition |
No. samples tested | ||||
|---|---|---|---|---|---|---|
| <20 | >20–<30 | >30–<40 | >40–<50 | >50 | ||
| HPA seroepidemiology study | 2,541 | 350 | 201 | 98 | 42 | 3,232 |
| PHLS farm workers cohort | 499 | 12 | 14 | 3 | 0 | 518 |
*HPA, Health Protection Agency; PHLS, Public Health Laboratory Service.
