“…DPV genomes from different countries are highly homologous to each other, but can be categorized into virulent and attenuated strains based on a number of virulence-related genes ( Aasdev et al, 2021 ). It has been reported that the UL2 gene predicted to encode uracil DNA glycosylasewhich play an important role in viral replication, and is significantly different between virulent and attenuated strains ( Xie et al, 2017 ). The UL2 gene of SD423 was analyzed and was identical to the Chinese, European and Indian strains; There is a large difference with the attenuated strain DEV K p63 ( Zou et al, 2014 ), SD423 has a 529 bp insertion after 281 bp.…”