Table 4 NS1 sequence characteristics and positive selection analysis results
| DENV serotype | DNA polymorphic site | Protein polymorphic site | pi (−) | pi (N) | pi (+) |
|---|---|---|---|---|---|
| DENV-1 (n = 21) | 190 | 30 | 93.6% | 2.6% | 3.7% |
| DENV-2 (n = 6) | 58 | 7 | NA | NA | NA |
| DENV-3 (n = 17) | 119 | 22 | 96.8% | 1.7% | 1.4% |
| DENV-4 (n = 4) | 38 | 5 | NA | NA | NA |