Enterotypes of the human gut microbiome

The vast majority of sequences in the newly sequenced 22 European
samples belong to bacteria—only 0.14% of the reads could be classified
as human contamination, all other eukaryotes together only comprised
0.5%, archaea 0.8% and viruses up to 5.8%

http://www-huber.embl.de/pub/pdf/Arumugam_Nature_2011.pdf