PRRS post-vaccinal immune response to MLV in PRRS multivaccinaled sows

Christelle Fablet (Anses) et al., 11th European Symposium of Porcine Management (ESPHM), 22-24 mai 2019, Utrecht, Pays-Bas

PRRS MLV vaccines are used to prevent reproductive disorders due to PRRSV in sows. Vaccine efficacy was proven only in sows vaccinated once or twice. In vaccinated herds, sows receive multiple vaccine boosters. To date, no data are available on the maintenance of PRRS immunity during these multiple revaccinations.