Collared peccary (Pecari tajacu) are susceptible to porcine reproductive and respiratory syndrome virus (PRRSV)

: Collared peccary (Pecari tajacu) and pigs (Sus scrofa) are two members of superfamily Suoidea that coexist in the Americas and share some of the same viral infections. Although porcine reproductive and respiratory syndrome virus (PRRSV) is among the most impactful pathogens of swine on a worldwide basis, the susceptibility of peccaries to PRRSV has not been investigated. In this study, three peccaries were intramuscularly inoculated with a PRRSV-2 field virus. One PRRSV-inoculated pig served as a positive control and two pigs and one peccary as negative controls. Serum samples were collected at regular intervals over a 23-day observation period and tested by PRRSV rtRT-PCR and isotype-specific (IgM, IgA, IgG) PRRSV ELISAs. The detection of viremia (DPI 3-23) and a PRRSV-specific humoural immune response (≥DPI 10) supported the conclusion that collared peccary are susceptible to PRRSV. The results raise questions regarding the natural history of PRRSV in non-Sus members of superfamily Suoidea and, more broadly, their role in the evolution and ecology of PRRSV.