Table 3 Isolation of influenza A virus in cell culture by sample and farm type

Sow herd

1

8/18* (44.4)

10/18 (55.5)

13/18 (72.2)

0/3 (0)

4/9 (44.4)

4/8 (50)

5/9 (55.5)

4/8 (50)

2

14/15 (93.3)

14/15 (93.3)

15/15 (100)

0/2 (0)

2/5 (40)

7/7 (100)

2/7 (28.5)

4/7 (57.1)

3

NT**

NT

NT

NT

NT

NT

NT

NT

4

5/6 (83.3)

6/9 (66.6)

5/6 (83.3)

1/1 (100)

2/2 (100)

2/3 (66.6)

0/3 (0)

1/3 (33.3)

5

7/15 (46.6)

7/15 (46.6)

7/12 (58.3)

0/0 (0)

2/5 (40)

5/6 (83.3)

0/5 (0)

0/8 (0)

6

NT

NT

NT

NT

NT

NT

NT

NT

Total^&

34/54 (62.9)^a

37/57 (64.9)^a

40/51 (78.4)^a

1/6 (16.6)^x

10/21 (47.6)^x

18/24 (75)^x

7/24 (29.2)^z

9/26 (34.6)^z

Wean-to- finish

1

NT

NT

NC***

NT

NT

NC

NT

NT

2

6/15 (40)

9/18 (50)

NC

0/3 (0)

0/3 (0)

NC

0/1 (0)

1/2 (50)

3

1/3 (33.3)

2/6 (33.3)

NC

0/6 (0)

0/6 (0)

NC

0/5 (0)

0/4 (0)

4

8/12 (66.6)

9/15 (60)

NC

0/5 (0)

5/5 (100)

NC

1/7 (14.2)

0/6 (0)

5

2/9 (22.2)

3/12 (25)

NC

0/5 (0)

1/7 (14.2)

NC

0/5 (0)

0/3 (0)

6

3/3 (100)

NT

NC

1/1 (100)

1/3 (33.3)

NC

1/3 (33.3)

0/4 (0)

Total

20/42 (47.6)^a

23/51 (45)^a

NC

1/20 (5)^x

7/24 (29.2)^x

NC

2/21 (9.5)^z

1/19 (5.3)^z