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Every human being serves as a home to thousands of different species of microbes. But scientists are now reporting that there are just three distinct microbial ecosystems in the guts of people they have studied.
The three "enterotypes" showed no particular link to ethnic background, sex, weight, health or age. One possibility is that the intestines of infants are simply randomly colonized by different pioneering species of microbes, which alter the gut so that only certain species can follow them.