design: Viral nucleic acids were extracted from 200 ul of the UTM buffer (in which the cloacal swabs were stored) and homogenized tissues using the High Pure Viral Nucleic Acid Kit (Roche Diagnostics, USA).  Rolling circle amplification (RCA) was used to preferentially amplify circular DNA in the extracts with a phi29 DNA Polymerase Kit (Watchmaker Genomics, Boulder, CO, USA) using 2 ul of extracted viral DNA. For sequencing library prepation, 15 ul of extracted viral DNA with 15 ul of the RCA products were combined per sample and then used to generate libraries using the Illumina DNA LP (M) Tag 96 sample preparation kit (Illumina Inc., San Diego, CA, USA). Libraries were sequenced on an Illumina NovaSeq X platform at Psomagen(Rockville, MD, USA) in multiplex mode with 96 libraries per lane (10B 300cycle).