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Table 1 Use of oxytetracykline in 8 batches of pigs vaccinated against proliferative enteropathy (PE) caused by Lawsonia intracellularis compared to 8 non-vaccinated batches.

From: Reduced use of antimicrobials after vaccination of pigs against porcine proliferative enteropathy in a Danish SPF herd

  Vaccinated Non-vaccinated Reduction after vaccination P-valuea
Total # pigs 7900 7756 - -
# batches 8 8 - -
# batches treated against PE 1 3 2 0.2482
# pigs treated against PE
Nursery site 1
300 2346 2046 < 0.0001
# pigs treated against PE
Nursery site 2
220 499 279 < 0.0001
Total # pigs treated against PE 520 2845 2325 < 0.0001
  Vaccinated Non-vaccinated Reduction after vaccination Reduction in %
Total amount of oxytetracykline 8.3 kg 38.9 kg 30.5 kg 79
  1. a: Chi-square test