Times article (from 5 years ago) describing an emerging awareness of gut-bacteria types much like blood types: http://www.nytimes.com/2011/04/21/science/21gut.h

Times article (from 5 years ago) describing an emerging awareness of gut-bacteria types much like blood types: http://www.nytimes.com/2011/04/21/science/21gut.html?_r=0 http://www.nytimes.com/2011/04/21/science/21gut.html?_r=0