Table 4.
Number of seropositive pigs against H3 swine influenza viruses by commercial H3N2 Swine influenza virus ELISA test and HI test in different farms and different age groups
| Farm | Groups | Jun.-Jul.2008 | Oct.-Nov.2008 | Jan.2009 | Jul. 2009 | Nov. 2009 | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ELISAa | HIb | nc | ELISA | HI | n | ELISA | HI | n | ELISA | HI | n | ELISA | HI | n | |||||||
| Ha | Hb | Ha | Hb | Ha | Hb | Ha | Hb | Ha | Hb | ||||||||||||
| B | Sow | 8 | 5 | 0 | 10 | 6 | 4 | 0 | 10 | 8 | 6 | 0 | 10 | 5 | 4 | 0 | 10 | 5 | 3 | 0 | 10 |
| Fattening pig | - d | 5 | 6 | 0 | 10 | 6 | 3 | 0 | 10 | 10 | 7 | 0 | 10 | 0 | 0 | 0 | 10 | ||||
| Weaned pig | 0 | 5 | 0 | 20e | 2 | 1 | 0 | 10 | 0 | 1 | 0 | 10 | 2 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | |
| Introduced pig | - | - | - | 1 | 3 | 0 | 10e | 0 | 0 | 0 | 10 | ||||||||||
| C | Sow | 5 | 0 | 4 | 10 | 1 | 0 | 4 | 10 | 2 | 0 | 3 | 10 | 1 | 0 | 1 | 10 | 3 | 0 | 0 | 10 |
| Fattening pig | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | |
| Weaned pig | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | |
| Introduced pig | - | - | - | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 11 | ||||||||||
| D | Sow | - | 0 | 0 | 0 | 10 | 2 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | 1 | 0 | 0 | 10 | |||
| Fattening pig | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | |||||
| Weaned pig | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | |||||
| E | Sow | 10 | 10 | 0 | 10 | 10 | 9 | 0 | 10 | 8 | 8 | 0 | 8 | - | - | ||||||
| Fattening pig | 0 | 0 | 0 | 10 | 2 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | |||||||||
| Weaned pig | 0 | 0 | 0 | 10 | 3 | 0 | 0 | 10 | 2 | 0 | 0 | 10 | |||||||||
| Introduced pig | - | - | 0 | 0 | 0 | 3 | |||||||||||||||
| F | Sow | - | 1 | 0 | 0 | 10 | 1 | 1 | 0 | 10 | 1 | 1 | 0 | 9 | - | ||||||
| Fattening pig | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | |||||||||
| Weaned pig | 1 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | 0 | 0 | 0 | 10 | |||||||||
aSample to positve (S/P) ratios were calculated using the optical density (OD) of each sample, positive control and negative control. The S/P rations greater than 0.40 were considered as positive for antibodies against H3N2 SIVs
bSamples showing HI activity at 1:40 or higher were considered as positive against antigens A/swine/Saraburi107725-28/2008 (H3N2) (Ha) and A/swine/Chachoengsao/2003 (H3N2) (Hb)
cNumber of serums collected
dSamples were not collected
eThe groups from which H3N2 SIVs were isolated