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What is the human microbiome? Every human being harbors between 10 trillion and 100 trillion microbial cells in a symbiotic relationship. Some research estimates that there are around 10 timesTrusted Source more microbial cells in the body than human cells, while other scientists claim the ratio is closer to 1:1. This symbiotic relationship benefits microbes and their hosts as long as the body is in a healthy state. Estimates vary, but there could be over 1,000 different species of microorganisms making up the human microbiota. The composition of the human biome can greatly varyTrusted Source between people. Different parts of the body will also host different microbial communities. For example, the oral cavity, genital organs, skin, gastrointestinal system, and respiratory tract all contain many microbial cells. Still, the types and levels and functions will vary between locations. What is the gut microbiota? The gut microbiota is a vast and complex collection of microorganism...