Table 1.
Summary of six sampling occasions from autumn (a) 2006 to spring (s) 2009 regarding antibody status to bovine coronavirus (BCV) and bovine respiratory syncytial virus (BRSV), measured in pooled milk samples of five home-bred primiparous cows in 79 dairy herds in four areas in Sweden.
| BCV |
BRSV |
|||||||
|---|---|---|---|---|---|---|---|---|
| Positive/totala | Neg-posb | Pos-negc | Incd | Positive/totala | Neg-posb | Pos-negc | Incd | |
| Halland | ||||||||
| a 2006 | 18/19 | NA | NA | NA | 16/19 | NA | NA | NA |
| s 2007 | 18/18 | 1 | 0 | 100 | 17/18 | 2 | 0 | 67 |
| a 2007 | 17/18 | NA | 1 | NA | 15/18 | 0 | 1 | 50 |
| s 2008 | 16/18 | 0 | 1 | 0 | 17/18 | 2 | 0 | 33 |
| a 2008 | 16/17 | 1 | 0 | 50 | 16/17 | 0 | 0 | 0 |
| s 2009 | 16/17 | 0 | 0 | 0 | 16/17 | 0 | 0 | 0 |
| Gotland | ||||||||
| a 2006 | 19/20 | NA | NA | NA | 19/20 | NA | NA | NA |
| s 2007 | 18/20 | 1 | 2 | 100 | 19/20 | 1 | 1 | 67 |
| a 2007 | 18/20 | 1 | 0 | 50 | 18/20 | 1 | 2 | 100 |
| s 2008 | 17/20 | 1 | 3 | 100 | 15/20 | 0 | 3 | 67 |
| a 2008 | missing | - | - | - | missing | - | - | - |
| s 2009 | 19/19 | 3 | 0 | 100 | 18/19 | 3 | 0 | 100 |
| Jämtland | ||||||||
| a 2006 | 16/20 | NA | NA | NA | 16/20 | NA | NA | NA |
| s 2007 | 14/20 | 1 | 3 | 25 | 11/20 | 0 | 5 | 0 |
| a 2007 | 8/21 | 1 | 7 | 17 | 2/21 | 0 | 9 | 0 |
| s 2008 | 10/16 | 4 | 0 | 40 | 1/16 | 0 | 1 | 0 |
| a 2008 | 11/17 | 2 | 0 | 17 | 0/17 | 0 | 1 | 0 |
| s 2009 | 11/18 | 0 | 1 | 0 | 1/18 | 1 | 0 | 6 |
| Västerbotten | ||||||||
| a 2006 | 14/20 | NA | NA | NA | 15/20 | NA | NA | NA |
| s 2007 | 11/20 | 1 | 4 | 17 | 15/20 | 1 | 1 | 20 |
| a 2007 | 8/20 | 1 | 4 | 11 | 14/20 | 0 | 1 | 0 |
| s 2008 | 10/19 | 4 | 1 | 33 | 12/19 | 0 | 1 | 0 |
| a 2008 | 8/19 | 0 | 2 | 0 | 10/19 | 1 | 3 | 14 |
| s 2009 | 13/19 | 4 | 0 | 45 | 9/19 | 2 | 3 | 25 |
NA, not applicable.
a
Number of positive herds/number of sampled herds.
b
Number of herds converting from antibody negative (neg) to positive (pos).
c
Number of herds converting from antibody positive to negative.
d
Incidence of antibody conversion from negative to positive for herds at risk (antibody negative on previous sampling).