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DENV infection rate per 1000 person-years during follow-ups 4–7 (2014–2016).
| Group | Type of infection | Person- years | Infections (n) | Incidence rate | 95% confidence interval | |
|---|---|---|---|---|---|---|
| Seronegative | Primary infections | 202.23 | 19 | 9.44 | 6.02 | 14.80 |
| Seropositive with at least one previous infections | Secondary infections | 155.00 | 15 | 9.62 | 5.80 | 15.95 |
| Seropositive with at least two previous infections | Postsecondary infections | 282.29 | 14 | 4.96 | 2.94 | 8.37 |
| Total | 639.52 | 48 | 7.50 | 5.66 | 9.96 | |
