title: virome  in human faeces
design: After obtaining relatively pure VLP samples, viral DNA (dsDNA, ssDNA) and RNA (ssRNA, dsRNA) were used.  The method of co-extraction extracts nucleic acid simultaneously.  Then, different library construction methods are selected for different viral genome types: dsDNA  Genome can directly construct DNA library, ssDNA needs to synthesize double stranded DNA before DNA library construction, RNA gene  Group B needs to be transformed into double-stranded cDNA through reverse transcription and two-strand synthesis before RNA library construction.