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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