http://www.ncbi.nlm.nih.gov/books/NBK7670/ wrong mix intestinal flora http://www.ncbi.nlm.nih.gov/books/NBK7670/ 400 bacterial species 400 bacterial species intestinal microflora Medical Microbiology; Sherwood L. Gorbach intestinal microbes http://www.ncbi.nlm.nih.gov/books/NBK7670/