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Table 1 Characteristics an influenza serological assay results of pigs sampled with serum specimen collections, January 2011 to November 2012

From: Serological report of influenza a (H7N9) infections among pigs in Southern China

Location

Pigs studied

Number sampled

Number (%) with ILI

Number (%) with serological evidence of avian H9N2 infection

Number (%) with serological evidence of avian H7N9 infection

Number (%) with serological evidence of H1N1 pdm09 infection

    

HI assay ≥1:20

MN assay ≥1:80

HI assay ≥1:20

MN assay ≥1:80

HI assay ≥1:20

MN assay ≥1:80

Jiangsu

Weaning pigs

84

18(21.4)

8(9.5)

4(4.8)

0(0)

0(0)

22(26.2)

14(16.7)

 

Finishing pigs

120

12(10)

14(11.7)

8(6.7)

2(1.7)

0(0)

48(40.0)

22(18.3)

 

Sows

92

12(13.0)

18(19.5)

12(13.0)

4(4.3)

0(0)

28(30.4)

18(19.6)

Zhejiang

Weaning pigs

92

10(10.9)

6(6.5)

2(2.2)

0(0)

0(0)

34(37.0)

10(10.9)

 

Finishing pigs

124

20(16.1)

14(11.3)

8(6.5)

0(0)

0(0)

40(32.3)

26(21.0)

 

Sows

108

18(16.7)

24(22.2)

16(14.8)

4(3.7)

0(0)

40(37.0)

20(18.5)

Guangdong

Weaning pigs

152

22(14.5)

10(6.6)

4(2.6)

0(0)

0(0)

50(32.9)

16(10.5)

 

Finishing pigs

124

8(6.5)

16(12.9)

12(9.7)

2(1.6)

0(0)

36(45.2)

28(22.6)

 

Sows

152

24(15.8)

32(21.1)

26(17.1)

8(5.3)

0(0)

66(43.4)

36(23.7)

Fujian

Weaning pigs

78

14(17.8)

6(7.7)

4(5.1)

0(0)

0(0)

26(33.3)

10(12.8)

 

Finishing pigs

94

6(6.4)

12(12.8)

6(6.4)

4(4.3)

0(0)

36(38.3)

18(19.1)

 

Sows

90

8(8.9)

18(20.0)

10(11.1)

2(2.2)

0(0)

38(42.2)

20(22.2)

Total

 

1310

172(13.3)

178(13.6)

112 (8.5)

26(2.0)

0(0)

464(35.4)

238(18.2)

  1. ILI = influenza-like-illness; HI = horse RBC hemagglutination inhibition assay; MN = microneutralization assay; H9N2 = A/chicken/Guangdong/V/2008(H9N2); H1N1 = A/California/7/2009pandemic (H1N1) ; H7N9 = A/Guangdong/GH074/2013(H7N9).