The study aimed to explore the prevalence and genetic evolution of porcine circovirus type 3(PCV3)in aborted fetuses.In this study,PCV3 detection,amplification and sequencing were performed on 680 samples of porcine abortion fetus in Hunan Province from 2015 to 2017,and the obtained sequences were analyzed by bioinformatics software for genetic evolution.The results showed that the positive rate of PCV3 in fetal samples of porcine abortion was 24.4%(166/680),and the positive rates from 2015 to 2017 were 18.2%(26/143),22.7%(54/238)and 28.8%(86/299),respectively.A full-length genomic sequence of...