Leman: PRRSV airborne shedding Controlling PRRSV aerosol transmission is a persistent challenge29 July 2026 29 July 2026 2 minute read 2 minute read By: By: Chris Wright North America[Excerpts of a presentation by Juan Mena Vasquez, Montserrat Torremorell and colleagues at the University of Minnesota, USA, during the 2025 Leman Swine Conference]The porcine reproductive and respiratory syndrome virus (PRRSV) is considered the most economically devastating swine disease in the US, with estimated annual losses exceeding $1 billion. Given its ability to spread via aerosols, controlling PRRSV transmission within and between farms is a persistent challenge. This study aimed to assess the levels and temporal dynamics of virus-laden aerosols from pigs experimentally infected with distinct clinically relevant PRRSV variants. Similar trends were observed for nasal shedding, with the difference that shedding of L1C.5 was lower after 11 DPI compared to the other two variants. This study advances the understanding of PRRSV transmission through the air and supports the notion that there are differences among PRRSV variants in their ability to become airborne.