TABLE 2.
Summary of the serological survey from 20 virus-positive domestic swine farms by HI assay
| Yr of sampling and farm | No. of sera positivea for B/Yamagata lineageb | Positive (%) | No. of sera positive for B/Victoria lineagec | Positive (%) |
|---|---|---|---|---|
| 2010-2011 | ||||
| 11-A | 0/27 | 0 | 5/27 (557) | 18.5 |
| 11-B | 0/10 | 0 | 2/10 (905) | 20.0 |
| 11-C | 0/7 | 0 | 1/7 (640) | 16.7 |
| 11-D | 0/30 | 0 | 1/30 (1,280) | 3.3 |
| 2012 | ||||
| 12-A | 0/12 | 0 | 1/12 (40) | 8.3 |
| 12-B | 4/12 (67)d | 33.3 | 1/12 (40) | 8.3 |
| 12-E | 0/16 | 0 | 5/16 (243) | 31.3 |
| 12-G | 1/11 (40) | 9.1 | 0/11 | 0 |
| 12-L | 1/13 (40) | 7.7 | 0/13 | 0 |
| 12-T | 2/12 (40) | 16.7 | 0/12 | 0 |
| 12-V | 1/12 (80) | 8.3 | 0/12 | 0 |
| 12-W | 2/10 (40) | 20.0 | 0/10 | 0 |
| S12-A | 2/10 (40) | 20.0 | 1/10 (160) | 10.0 |
| S12-B | 5/10 (61) | 50.0 | 0/10 | 0 |
| S12-D | 1/10 (160) | 10.0 | 0/10 | 0 |
| S12-E | 1/10 (40) | 10.0 | 0/10 | 0 |
| S12-G | 0/12 | 0 | 4/10 (48) | 40.0 |
| S12-J | 0/5 | 0 | 1/5 (320) | 20.0 |
| S12-K | 4/12 (40) | 33.3 | 0/12 | 0 |
| S12-S | 1/8 (1,280) | 12.5 | 1/8 (160) | 12.5 |
a
Data are positive sample numbers out of the total number tested.
b
Yamagata lineage B/Wisconsin/1/2010 was used.
c
Victoria lineage B/Brisbane/60/2008 was used.
d
Numbers in parentheses indicate geometric mean HI titers for samples with a value of ≥40.