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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