Here's How Many Cells in Your Body Aren't Actually Human
1.3-to-1, with the average human playing host to around 100 trillion microbes
https://www.sciencealert.com/how-many-bacteria-cells-outnumber-human-cells-microbiome-science
Revised Estimates for the Number of Human and Bacteria Cells in the Body
https://journals.plos.org/plosbiology/article?id=10.1371/journal.pbio.1002533
‘All disease begins in the gut’: was Hippocrates right?
https://academic.oup.com/brain/article/141/3/e20/4850980
Brains and Bacteria
https://www.psychologicalscience.org/observer/brains-and-bacteria
Are We Really Vastly Outnumbered? Revisiting the Ratio of Bacterial to Host Cells in Humans
https://www.cell.com/cell/fulltext/S0092-8674(16)00053-2
The microbiome is changing our concept of self
https://www.cifar.ca/cifarnews/2018/03/16/the-microbiome-is-changing-our-concept-of-self