Numerous uncharacterized and highly divergent microbes which colonize humans are revealed by circulating cell-free DNA

 Through massive shotgun sequencing of circulating cell-free DNA from the blood of more than 1,000 independent samples, we identified hundreds of new bacteria and viruses which represent previously unidentified members of the human microbiome. Previous studies targeted specific niches such as feces, skin, or the oral cavity, whereas our approach of using blood effectively enables sampling of the entire body and reveals the colonization of niches which have been previously inaccessible. We were thus able to discover that the human body contains a vast and unexpected diversity of microbes, many of which have highly divergent relationships to the known tree of life."



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