The red spot diagram represents CPV-2 strains identified in this study. The values in parentheses indicate the number of strains with identical sequences to that included in the tree. (1): KT074275 from Daqing; (2): KT074317 and KT074304 from Harbin; (6): KT074266, KT074270 from Mudanjiang; KT074276, KT074288, KT074293, and KT074306 from Harbin; (8): KT074262, KT074264, and KT074271 from Mudanjiang; KT074277, KT074282, KT074311, KT074314, and KT074315 from Harbin. (13): KT074340-KT074347 from Harbin; KT074348-KT074352 from Mudanjiang. (17): KT074320-KT074322 and KT074324-KT074334 from Harbin; KT074336-KT074338 from Daqing; (35): KT074267-KT074269 and KT074272 from Mudanjiang; KT074273 and KT074274 from Daqing; KT074278, KT074279, KT074280-KT074287, KT074289- KT074291, KT074294- KT074298, KT074300- KT074302, KT074305, KT074307- KT074310, KT074312, KT074313, KT074316, and KT074318 from Harbin.