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Change in antibody status over time in longitudinal cohort of children ages 1–9 years.
| Antibody Status at baseline | Antibody status at one year follow up | Total | ||
|---|---|---|---|---|
| Negative | Positive | |||
| Negative | 1311 | 143 | 1465 | Seroconversion rate = 9.8% |
| Positive | 42 | 615 | 656 | Seroreversion rate = 6.4% |
