Genetic relationship of HuCV2 from 2 patients in China to other circoviruses. A, B) Pairwise identities of the rep (A) and cap (B) protein of HuCV2 isolate YN09/J030 to other circoviruses. C) Comparison of main residues in the conserved domains of rep protein (RCR and SF3 helicase motifs) between HuCV2 isolates YN09/J030 and YN09/347 and other circoviruses. Asterisks (*) indicate unique residues that are different from PCV3 or WoCV. BatCV, bat-associated circovirus; BearCV, bear-associated circovirus; Cap, capsid protein; HuCV, human-associated circovirus; PagumaCV, paguma circovirus; PCV, porcine circovirus; RCR, rolling circle replication; Rep, replication-associated protein; RoCV, rodent-associated circovirus; SF3, superfamily 3; WoCV, wolverine-associated circovirus.