There are trillions of bacteria living inside our bodies and on the body’s outer surface. All these bacteria comprise what we call as the bacterial flora, microbiome, or microbiota.​

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The balance between each population of bacteria is crucial to the human body’s homeostasis and general health, especially, in the gastrointestinal system.

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Dysbiosis is often defined as an “imbalance” in the gut microbial community that is associated with disease. This imbalance could be due to the gain or loss of community members or changes in relative abundance of microbes.