Which is an example of normal flora?

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Normal flora usually does not cause disease,but instead help to maintain health.The number and variety of flora maintain a sensitive balance with other microorganisms to prevent infection.The body's normal flora is made up of a large numbers of microorganisms residing on the surface and deep layers of the skin,in the saliva and oral mucosa,and in the intestinal walls.Bacteria within the colon that help digestion are an example of normal flora.Microorganisms that cause infection are not considered normal flora.

Which Is an Example of Normal Flora