The PRRSV vaccine used in the prophylactic plan was
Porcilis® PRRS (Intervet International BV, Boxmeer,
Netherlands), a European live attenuated PRRS virus strain DV,
administered every 4 months to sows on the multiplication unit
building. The primovaccination of all gilts was performed on the
quarantine facilities. The vaccination plan also included the
Aujeszky's disease virus and Circovirus. The offspring pigs were
only vaccinated against Circovirus. The farm used this vaccination
plan at least during the last 3 years.