<P> The Human Microbiome Project took on the project of sequencing the genome of the human microbiota, focusing particularly on the microbiota that normally inhabit the skin, mouth, nose, digestive tract, and vagina . It reached a milestone in 2012 when it published its initial results . </P> <P> Though widely known as flora or microflora, this is a misnomer in technical terms, since the word root flora pertains to plants, and biota refers to the total collection of organisms in a particular ecosystem . Recently, the more appropriate term microbiota is applied, though its use has not eclipsed the entrenched use and recognition of flora with regard to bacteria and other microorganisms . Both terms are being used in different literature . </P> <P> As of 2014, it was often reported in popular media and in the scientific literature that there are about 10 times as many microbial cells in the human body as there are human cells; this figure was based on estimates that the human microbiome includes around 100 trillion bacterial cells and that an adult human typically has around 10 trillion human cells . In 2014, the American Academy of Microbiology published a FAQ that emphasized that the number of microbial cells and the number of human cells are both estimates, and noted that recent research had arrived at a new estimate of the number of human cells--approximately 37.2 trillion, meaning that the ratio of microbial - to - human cells, if the original estimate of 100 trillion bacterial cells is correct, is closer to 3: 1 . In 2016, another group published a new estimate of the ratio being roughly 1: 1 (1.3: 1, with "an uncertainty of 25% and a variation of 53% over the population of standard 70 - kg males"). </P> <P> The problem of elucidating the human microbiome is essentially identifying the members of a microbial community which includes bacteria, eukaryotes, and viruses . This is done primarily using DNA - based studies, though RNA, protein and metabolite based studies are also performed . DNA - based microbiome studies typically can be categorized as either targeted amplicon studies or more recently shotgun metagenomic studies . The former focuses on specific known marker genes and is primarily informative taxonomically, while the latter is an entire metagenomic approach which can also be used to study the functional potential of the community . One of the challenges that is present in human microbiome studies, but not in other metagenomic studies is to avoid including the host DNA in the study . </P>

How many organisms are in a human body
find me the text answering this question