We always know that the number of bacteria and other microbes in human's body are larger than our human's own cells by the ratio of 10 to 1. However, researchers from Israel and Canada suggest people forget this "myth". They think that the ratio between resident microbes and human cells may be 1 to 1 as they calculate.
Scientists find bacteria bonanza in a remote village in Amazon. According to Ron Milo and Ron Sender, there is a man contains on average about 30 trillion human cells and 39 trillion bacteria. They are scientists form Weizmann Institute of Science in Rehovot, Israel, and Shai Fuchs at the Hospital for Sick Children in Toronto, Canada. The numbers are approximate. It means there may be another person who have half as many or twice as many bacteria, but the results are far from the 10:1 ratio as people always think.
“The numbers are similar enough that each defecation event may flip the ratio to favour human cells over bacteria,” they delicately conclude in a manuscript posted to the preprint server bioRxiv1.
To create global microbiome effort, the scientists expressed their doubts about the 10:1 claim. They think that there were very few good estimates for the numbers of human and microbial cells in the body. Sender, Milo and Fuchs made up their mind to re-estimate the number. They reviewed a wide range of recent experimental data in the literature including DNA analyses to calculate cell number and magnetic-resonance imaging to calculate organ volume. The scientists found that the most of human cells are red blood cells.
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