Table 2 Risk factors for elevated antibody against influenza A viruses by horse RBC hemagglutination inhibition assay (titer ≥1:20) among pigs sampled in Jiangsu , Zhejiang , Guangdong and Fujian Provinces China
From: Serological report of influenza a (H7N9) infections among pigs in Southern China
A/chicken/Guangdong/V/2008(H9N2) | A/Guangdong/GH074/2013(H7N9) | A/California/7/2009pandemic (H1N1) | ||||
|---|---|---|---|---|---|---|
Risk factor | Number (%) | OR (95% CI) | Number (%) | OR (95% CI) | Number (%) | OR (95% CI) |
Location | ||||||
Jiangsu | 40(13.5) | 1.0[0.63-1.58] | 6(2.0) | 1.7[0.46-5.93] | 98(33.1) | 0.92[0.65-1.27] |
Fujian | 36(13.7) | 1.0[0.63-1.63] | 6(2.3) | 1.9[0.52-6.72] | 100(38.2) | 1.1[0.81-1.59] |
Guangdong | 58(13.6) | 1.0[0.65-1.52] | 10(2.3) | 1.9[0.59-6.16] | 152 (29.2) | 1.0[0.75-1.37] |
Zhejiang | 44(13.6) | reference | 4(1.2) | reference | 114(35.2) | reference |
Pigs studied | ||||||
Sows | 92(20.8) | 3.3[2.13-5.10] | 18(4.1) | 35.4[2.13-590.30] | 172(38.9) | 1.3[0.10-1.75] |
Finishing pigs | 56(12.1) | 1.7[1.09-2.75] | 8(1.7) | 15.2[0.84-264.4] | 160(34.6) | 1.0[0.83-1.46] |
Weaning pigs | 30(7.4) | reference | 0(0.0) | reference | 132(32.5) | reference |
Time | ||||||
2012 | 103(17.7) | 1.4[0.98-1.87] | 20(3.4) | 3.2[1.28-8.07] | 252(43.3) | 1.2[0.95-1.54] |
2011 | 75(13.7) | reference | 6(1.1) | reference | 212(38.7) | reference |
ILI | ||||||
No | 170(14.9) | 3.6[1.74-7.46] | 24(2.1) | 1.8[0.43-7.82] | 390(34.3) | 3.9[2.49-6.08] |
Yes | 8(4.6) | reference | 2(1.2) | reference | 24(14.0) | reference |