Table 1: PCR- based detection results for PCV3 in northern Vietnam.
| Province | Number of positive/tested samples for each year | ||
| 2011 | 2016 | 2017 | |
| Bac Giang | 0/17 | NA | NA |
| Hoa Binh | 0/12 | 0/4 | NA |
| Thai Nguyen | 0/2 | NA | NA |
| Bac Ninh | 0/6 | 0/1 | NA |
| Ha Noi | 1/9 | 0/48 | 3/7 |
| Hai Duong | 0/6 | 0/1 | NA |
| Hung Yen | 0/8 | 2/14 | NA |
NA: Not Available.