Porcine reproductive and respiratory syndrome virus ( PRRSV ) is an economically important swine pathogen .
Since its discovery in the early 1990s , tremendous progresses have been made in understanding the molecular biology and pathogenesis of PRRSV .
Porcine reproductive and respiratory syndrome virus ( PRRSV ) is an economically important swine pathogen .
Since its discovery in the early 1990s , tremendous progresses have been made in understanding the molecular biology and pathogenesis of PRRSV .