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| Date | No. samples (no. positive) | IU/mL* |
|---|---|---|
| 2005–2007 | 63 (0) | 0 |
| Apr–Jul 2008 | 30 (5) | 0.20, 0.33, 0.45, 0.5, 0.8 |
*Arbitrary cut-off value for seroconversion is 0 IU/mL.
