Fig. 4

QC and distribution of reads including dark viral matter. a The chart shows the number of NGS reads retained per sample through QC, interlacing and de novo assembly. b Sample reads, along the x-axis and their aligned origins are shown as stacked bars. Shown in black, unmapped viral ‘dark matter’ is of high interest across virology studies. Blue bars represent bacterial ribosome, green for human while red is for known viral matches