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)