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Table 2 Number of negative, vaccinated and positive herds and pigs in the study (4852 pigs from 103 herds in GB)

From: Porcine reproductive and respiratory syndrome virus (PRRSV) in GB pig herds: farm characteristics associated with heterogeneity in seroprevalence

Age of pigs

Negative

Vaccinated

Positive

Total

 

Herds

Pigs

Herds

Pigs

Herds

Pigs

Herds

Pigs

8 weeks

35

348

27

264

40

395

102

1007

14 weeks

34

339

27

256

40

396

101

991

Gilts

34

166

27

135

41

204

102

505

Parity 1

33

151

26

129

41

192

100

472

Parity 2

33

157

26

131

41

193

100

481

Parity 3

32

147

25

120

39

192

96

459

Parity 4

32

142

26

123

40

192

98

457

Parity 5+

32

160

26

126

40

194

98

480

Total

35

1610

27

1284

41

1958

103

4852

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BMC Veterinary Research

ISSN: 1746-6148

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