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| Study areas | Number positive/total | Number seropositive | Proportion positive (%) | |||
|---|---|---|---|---|---|---|
| Clade 1 | Clade 2.3.4 | Clade 2.3.2.1 | Clades 2.3.4 and 2.3.2.1 | |||
| Hanoi | 22/305 | 0 | 13 | 2 | 7 | 7.2 |
| Thaibinh | 9/169 | 0 | 6 | 0 | 3 | 5.3 |
| Thanhhoa | 6/133 | 0 | 5 | 0 | 1 | 4.5 |
| Total | 37/607 | 0 | 24 | 2 | 11 | 6.1 |
