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| Seroprevalence rate (%) |
||
|---|---|---|
| Age groups | 1997 | 2004 |
| 1 | 28 | 8 |
| 2 | 56 | 22 |
| 3 | 98 | 58 |
| 4 | 96 | 100 |
| 5 | 100 | 100 |