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Table 3 Percentage of influenza A virus-positive pools 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
Positive pools
 Week 1 (4/16) 25% (3/15) 20% (8/16) 50%
 Week 3 (8/16) 50% (5/15) 33.3% (6/16) 37.5%
 Week 5 (3/16) 18.7% (7/15) 46.7% (10/16) 62.5%
 Weeks 10–12 (0/16) 0% (1/15) 6.6% (0/16) 0%
 Total (11/16) 69% (12/15) 80% (14/16) 87.5%