Current estimates are that there are slightly more bacteria than human cells (3.8x10^13 vs 3.0x10^13) in a "reference man". However, the mass of the bacteria is

Current estimates are that there are slightly more bacteria than human cells (3.8x10^13 vs 3.0x10^13) in a "reference man". However, the mass of the bacteria is only 0.2kg, so human cells totally dominate by mass. Interestingly, most of the human cells by count are red blood cells. http://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.1002533 http://journals.plos.org/plosbiology/article?id=10.1371/jour...