A newly emerging porcine circovirus, designated PCV3, has been reported in various countries (USA, Poland, South Korea and China) since 2017. Its presence may be associated with porcine dermatitis and nephropathy syndrome (PDNS), reproductive failure, and multisystem inflammation. In this study, we report identification of PCV3 in cases of reproductive failure in various regions in Hunan, China. From January 2015 to December 2016, sera were collected from 190 sows from seven farms with reproductive problems. Specifically, 85 samples were from sows with a history of reproductive failure, wherea...