The farm under discussion is a continuous flow production from farrowing to finisher, with an on-site gilt development unit (GDU) and genetic transfer centre (GTC). For years, the farm was free from PRRSV, PRV, CSF, and Mycoplasma hyopneumoniae until 2019, when it began to show clinical signs in the farrowing rooms, breeding and gestation pens, and nursery rooms. Miles Yao at PIC puts forward a case study on PEDV elimination in a breeder farm.