Porcine parvovirus(PPV),a major cause of reproductive failure in swine,resulted in early embryonic death,fetal death,still births, and delayed return to estrus.

• 猪细小病毒（PorcineParvovirus，PPV）是一自主型细小病毒（Autonomousparvovirus），它是引起畸胎的主要因素之一。