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Table 2 Seroprevalence of avian influenza virus in farmed minks

From: Avian influenza virus H9N2 infections in farmed minks

Viral antigens

Antibody titers using HI testa

% (No. of positive samples/total no.)

≤1:20

1:40

1:80

1:160

1:320

1:640

1:1280

H5N1(RE-5)

550

8

2

0

0

0

0

1.8 % (10/560)

H5N1(RE-7)

524

36

0

0

0

0

0

6.4 % (36/560)

H9N2 (A/chicken/Shanghai/10/01)

294

64

80

74

30

16

2

47.5 % (266/560)

H9N2(A/Chicken/Hebei/4/2008)

306

80

76

55

26

15

2

45.4 % (254/560)

H7N9(A/Pigeon/Shanghai/S1069/2013)

560

0

0

0

0

0

0

0(0/560)

  1. aThe HI titer was expressed as the reciprocal of the highest serum dilution that completely inhibited hemagglutination of 4 HA units of the virus. HI titers ≥ 1:40 was considered to be positive