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Table 4 Percentage of influenza A virus-positive pigs from nasal swabs collected from pigs and tested by RT-PCR

From: Longitudinal field studies reveal early infection and persistence of influenza A virus in piglets despite the presence of maternally derived antibodies

  Herd 1 Herd 2 Herd 3
Week 1 17.3% (13/77a) 9.2% (6/65a) 34.6% (27/78a)
Week 3 16.2% (11/68) 15.9% (10/63) 29.5% (23/78)
Week 5 4.8% (3/62) 20.3% (12/59) 36% (28/78)
Week 10–12 0% (0/61) 2% (1/45) 0% (0/76)
Total 34% (26/77) 41.5% (27/65) 69% (54/78)
  1. aThe total number of piglets present at the beginning of the study deviates from 80 due to mortality between birth and first sampling. Pigs that have been infected twice only count once in the total prevalence.