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Association between pre-booster and post-booster anti-HBs levels (p = 0.045 by Fishers exact test; n = 34).
| Post-booster anti-HBs level | Pre-booster anti-HBs <10 IU/l | Pre-booster anti-HBs 10–99 IU/l |
|---|---|---|
| <10 IU/l | — | — |
| 10–99 IU/l | 1 | 0 |
| 100–999 IU/l | 12 | 2 |
| ≥ 1000 IU/l | 9 | 10 |
