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Table 6 Prevalence of nasal discharge of virus-positive and -negative animals

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

  Week 1 Week 3 Week 5 Total
Herd 1
 Virus positive 23% (3/13) 30.1% (4/13) 0% (0/3) 36.8% (7/19)
 Virus negative 12.5% (8/64) 47.3% (26/55) 50.8% (30/59) 35.9% (64/178)
 P-value 0.58 0.43 0.26 0.861
Herd 2
 Virus positive 100% (6/6) 70% (7/10) 83.3% (10/12) 82.1% (23/28)
 Virus negative 44% (26/59) 32.7% (17/52) 34% (16/47) 37.3% (59/158)
 P-value 0.03 0.062 0.006 < 0.0001
Herd 3
 Virus positive 77.8% (21/27) 91.3% (21/23) 78.6% (22/28) 82% (64/78)
 Virus negative 62.7% (32/51) 81.8% (45/55) 86% (43/50) 76.9% (120/156)
 P-value 0.26 0.47 0.6 0.46
  1. The results were considered significant at P < 0.05.