The precise number of species of bacteria prenent on and in the human body is not known, however it is estimated that roughly 500 to 1,000 different species live on the skin, and another 500 to 1,000 in the gut. Most other areas of the body, such as the brain, blood, and muscle tissue, do not contain any microorganisms. In all, there are thought to be about 100 billion individual bacteria on the average human’s skin.
As stated in the above answer, a healthy individual does not have bacteria residing in the internal tissue such as the blood, brain, muscle, etc. However, surface tissue such as skin and mucous membranes are colonized by large amounts of microbial species such as eukaryotic fungi, protists, and bacteria.
Scientists now believe that there are up to 500 different bacteria species living on the skin. However, the intestinal tract contains the most bacteria within the human body.
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