Table:
Antibody concentration	Number of subjects	Percent
<10 IU/ml	25	21.9
≥10 IU/ml and ≤ 100IU/ml	28	24.6
> 100IU/ml	61	53.5
Total	114	100

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| Antibody concentration | Number of subjects | Percent | 
 | --- | --- | --- | 
 | <10 IU/ml | 25 | 21.9 | 
 | ≥10 IU/ml and ≤ 100IU/ml | 28 | 24.6 | 
 | > 100IU/ml | 61 | 53.5 | 
 | Total | 114 | 100 |