Do you know your gut microbiota?

Which statement is the best description of our current knowledge of the human microbiota?

A) We’re close to having a complete picture of which microbes live on or in which parts of the human body. For most of the common microbial types, we understand how they interact with each other, and how they influence human health.
B) We mostly understand the composition and activity of our native microbiota when we’re healthy. The focus now is on understanding how the microbiota changes during various diseases, and on developing treatments that can make specific changes to the microbiota.
C) We can recognize the typical composition of the microbiota at different body sites, and have found some consistent differences in the microbiota between healthy individuals and those with certain diseases. We understand some of the effects of some types of microbe. However, our understanding of the composition of the human microbiota, and especially of its activity and effects, remains incomplete.

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