Most of the viruses present in people’s guts are bacteriophages, but how they interact with resident bacteria is still an open question.

Meet some of the people featured in the November 2016 issue of The Scientist.

Some of our resident viruses may be beneficial.

Diverse viruses can be found commingling with human and bacteria cells in and on people’s bodies. Scientists are just beginning to understand how these viruses help and when they can turn pathogenic.