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Table 4 Number (percentage) of influenza A virus rRT-PCR positive environmental samples by farm and sampling point event after whole herd sow vaccination and implementing enhanced biosecurity protocols

From: Evaluation of internal farm biosecurity measures combined with sow vaccination to prevent influenza A virus infection in groups of due-to-wean pigs

Experimental group

Farm

Sampling events

 

Week 12 (%)

Week 13 (%)

Week 14 (%)

Total (%)

Treatment

A

10/10a (100)

6/14 (42.9)

6/6 (100)

22/30 (73.3)

Treatment

B

6/6 (100)

0/10 (0)

1/6 (17)

7/22 (31.8)

Treatment

C

0/8 (0)

0/8 (0)

0/8 (0)

0/24 (0)

Treatment

D

0/8 (0)

0/8 (0)

0/8 (0)

0/24 (0)

Treatment

E

0/6 (0)

0/6 (0)

0/4 (0)

0/16 (0)

Control

F

6/6 (100)

3/3 (100)

4/4 (100)

13/13 (100)

  1. Environmental samples were tested individually. A specimen was considered positive when the rRT-PCR cycle threshold < 37
  2. Sampling events refer to 12, 13 and 14 weeks after biosecurity protocol was initiated
  3. aNumber of positive samples / total number of samples tested (percentage)