At this stage, the within batch prevalence (in positive batches) increased from 4.6% (5th = 0.6%; 95th percentile = 12.4%) for scenarios with a 100% decontamination efficacy to 10.1% (5th percentile = 2.1%; 95th percentile = 19.4%) for scenarios with 50% decontamination (the only scenario in which decontamination of the rooms of the sows was decreased).