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spacedaily.com 24/06/2026

For decades, scientists repeated as established fact that bacteria in the human body outnumber human cells ten to one — a 2016 study by the Weizmann Institute of Science reviewed the original source and found the actual ratio is closer to 1:1, making the figure one of the most widely cited errors in modern biology

For a long time, one number did a great deal of work in popular accounts of human biology. Ten to one: for every cell that was genetically yours, ten bacteria were along for the ride, making you, in some loosely held sense, more microbial than human.