We often think of microbes as organisms that live around us, like the salmonella bacteria and flu viruses that cause illness. But some of our most intimate relationships are actually with the microbes living inside of us.
Incredibly, about half of the cells in the human body are actually microbial inhabitants. Scientific attention to the microbiome has helped us understand how many of them support our health; for example, by helping us digest food or by supporting our immune system.
