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Table 7 Accumulated results of the clinical data from all three herds (CI and nasal discharge)

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

Mean CI

Week 1

Week 3

Week 5

Total

Herds 1, 2 and 3

 Virus positive

0.099

0.31

0.092

0.176

 SD

0.12

0.22

0.07

0.18

 Virus negative

0.072

0.348

0.078

0.17

 SD

0.09

0.39

0.05

0.27

 P-value

0.43

0.70

0.52

0.87

Prevalence of nasal discharge

 Virus positive

65.2% (30/46)

69.6% (32/46)

74.4% (32/43)

69.6% (94/135)

 Virus negative

38% (66/174)

55.3% (88/162)

57% (89/156)

49.4% (243/492)

 P-value

0.002

0.093

0.059

< 0.0001

  1. Results were considered significant at P < 0.05. “SD” is the standard deviation.