In 2004, Mary O’Brien, an oncologist at the Royal Marsden Hospital in London, published a paper with unexpected results: She injected lung cancer patients with a common, harmless soil bacteria, Mycobacterium vaccae, to see if it could prolong their life. So far, the results have been uplifting-to both the scientists and the subjects they study. But in a string of pioneering studies, scientists are beginning to look at what would happen if we literally inject microbes from the soil into our bodies, reintroducing us to the ancient relationship between bacteria and human.
Lately, thanks to modern life, we don’t let in a lot.
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