Table 5. Epidemiologic information of culled persistently infected (PI) cattle and result of testing for bulk tank milk.
| Farm no. | Period sampling | Type of screening a) | Viral RNA b) in MTS | Antibody in BTM | No. of PI cattle | Stage of PI cattle | Date of introduction |
|---|---|---|---|---|---|---|---|
| 1 | 9/18/2016 | Pilot-MTS/BTM | + (6.5t) | + | 1 | Lactating cow | 10/25/2013 |
| 7/19/2017 | Regional-MTS/BTM | - | - | 0 | - | - | |
| 2 | 9/18/2016 | Pilot-BTM | - | + | 0 | - | - |
| 7/19/2017 | Regional-MTS/BTM | + (11.5t) | + | 1 | Lactating cow | 9/13/2016 | |
| 3 | 5/30/2017 | Regional-MTS | + (4.2t) | - | 1 | Lactating cow | 8/24/2013 |
| 4 | 5/30/2017 | Regional-MTS/BTM | + (3.2t) | + | 1 | Lactating cow | 12/15/2015 |
| 1 | Calf | 11/17/2016 | |||||
| 5 | 7/19/2017 | Regional-BTM | - | + | 3 | Calves | 2/11/2017 |
| 2/12/2017 | |||||||
| 9/6/2017 | |||||||
a) Pilot: pilot survey, regional: regional survey, MTS: milk tanker sample, BTM: bulk tank milk. b) ( ): Maximum capacity of milk collecting vehicle detected viral RNA. RNA=ribonucleic acid.