For those interested in the topic of microbes living in/on our bodies, I highly recommend Ed Yong's book I Contain Multitudes:
https://www.goodreads.com/book/show/27213168-i-contain-multi...
He is a fantastic writer, and I really enjoyed the book. You might also be familiar with his COVID articles for The Atlantic, which were some of the best coverage of COVID issues throughout 2020.