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Table 1 Specimen collection and IAV-S isolated from different pig production stages and age groups in Vietnam

From: Effect of herd size on subclinical infection of swine in Vietnam with influenza A viruses

   IAV-S positive IAV-S negative P valuea Number of IAV-S in each subtype
   number % number %   H1N1 H1N2 H3N2
Stage Suckling pig 0 0 290 4.2 <0.001 0 0 0
Weanling pig 107 62.2 3268 47.6 19 17 71
Fattening pig 65 37.8 2671 38.9 23 32 10
Finishing pigb 0 0 375 5.5 0 0 0
Sow 0 0 240 3.5 0 0 0
Boar 0 0 18 0.3 0 0 0
Age 0 to <1 month old 22 12.8 467 6.8 <0.001 0 7 15
1 to <2 months old 80 46.5 2593 37.8 17 12 51
2 to <3 months old 46 26.7 2030 29.6 14 20 12
3 to <6 months old 24 14.0 1139 16.6 11 10 3
>6 months old 0 0 633 9.2 0 0 0
Number of viruses isolated 172     42 49 81
  1. aFisher’s exact test
  2. bSamples from finishing pigs were collected at slaughterhouses