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Table 2 Pre-weaning mortality including stillborn piglets when the five-month period after infection with the new PRRS1-variant was compared to the preceding 7 months in the 13 herds included in the study

From: Production losses five months after outbreak with a recombinant of two PRRSV vaccine strains in 13 Danish sow herds

Herd

Pre-weaning mortality before infection (%)

Pre-weaning mortality after infection (%)

Factor increase in pre-weaning mortality when comparing period before and after infection

A

24%

46%

1.92

B

20%

45%

2.27

C

22%

24%

1.09

D

23%

42%

1.85

E

31%

38%

1.22

F

24%

43%

1.80

G

26%

44%

1.74

H

23%

41%

1.78

I

27%

32%

1.15

J

22%

39%

1.73

K

20%

31%

1.57

L

22%

34%

1.56

M

27%

44%

1.66