A comparison of the severity of reproductive failure between single and dual infection with porcine reproductive and respiratory syndrome virus (PRRSV)‐1 and PRRSV‐2 in late‐term pregnancy gilts

The objective of this study was to compare the severity of reproductive failure caused by either a single or a dual infection with porcine reproductive and respiratory syndrome virus (PRRSV)‐1 and PRRSV‐2 in late‐term pregnancy gilts. Pregnant gilts were intranasally administered PRRSV‐1, PRRSV‐2 or both at 3 weeks before the expected farrowing date (93 days of gestation). Regardless of single and dual infection, PRRSV‐infected pregnant gilts experienced premature farrowing (103–109 days of gestation) compared with negative control gilts which carried their pregnancy to full term (114–115 days of gestation). Pregnant gilts infected with only PRRSV‐1 had a significantly (p