Table 7. Serological results for flaviviruses for episodes in children of 60 days or older (n = 1125).
| Serological interpretation | NS1 positive | NS1 negative | Number of positive samples |
| Acute dengue virus infection | 59 | 55 0 | 114 (10.1%) |
| Acute/recent dengue virus infection | 0 | 84 4 | 84 (7.5%) |
| Total dengue virus infections | 198 (17.6%) | ||
| Acute JEV | 1a | 37 1 | 38 (3.4%) |
| Acute/recent JEV | 0 | 34 1 | 34 (3.0%) |
| Total JEV infections | 72 (6.4%) | ||
| Acute indeterminate flavivirus infection | 0 | 0 | 0 |
| Acute/recent indeterminate flavivirus infection | 0 | 65 2 | 65 (5.8%) |
| Total indeterminate flavivirus infections | 65 (5.8%) | ||
| Total positive to flaviviruses | 60 | 275 8 | 324 (28.8%) |
| Negative to flaviviruses | 0 | 801 23 | - |
By definition, all NS1 positive samples were denoted “acute dengue virus serology”, and all CSF IgM positive samples were “acute serology” (although we acknowledge that NS1 antigen assay is not a serological test). Numbers in superscript denote samples with insufficient serum for NS1 antigen assay.
a
CSF positive for anti-JEV IgM, serum positive for NS1 and anti-DENV IgM in same episode (diagnosed with both).