“…Phylogenetic analysis showed that the JY strain was the first German-like PPV isolate discovered in China ( Hao et al., 2011 ). More reports indicate that isolated strains, such as PPV2010, J-PPV, and GD2013, have the characteristics of becoming vaccine strains ( Cui et al., 2012 ; Deng et al., 2020 ; Wang et al., 2014 ). The BQ strain isolated in 2005 has been developed by our laboratory into an inactivated vaccine that is not yet on the market ( Shangjin et al., 2009 ).…”