The human body is essentially an ecological environment. Amid the 37 trillion human cells, there are tens of trillions of microbial organisms from hundreds of different species. Depending on the niche of the body, such as the mouth, the eye, or the gut, several species can be found living in the biological fluid. For the researchers, these individual types, known collectively as the microflora, offer the perfect base for a rapid, real-time audit of cleanliness. All that’s needed is to identify the genetic material of these species, known as microflora DNA, or mfDNA.