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    Alpha Hemolysis on Blood Agar, Indicating Normal Flora


    What Are Normal Flora?
    Resident, Transient and Opportunistic Microbes 





    Within the womb, a baby’s body is axenic, meaning that the environment within the uterus is sterile. During and after birth, the newborn becomes colonized by microbes, most of which are beneficial to human health. These bacteria are called normal flora or normal microbiota.

    Article Summary: The human body is made up of about 10 trillion cells, but hosts 100 trillion more. The vast majority of cells living on and in the body are bacteria and other microbes.
    What Are Normal Flora Microbes?
    Normal flora bacteria cover our skin, mucous membranes and colonize our intestines.
    Normal flora bacteria cover our skin, mucous membranes and colonize our intestines.
    ​Page last updated: 3/2016


    ANAT & PHYSGENERAL BIOCELL BIOMICRO 8wkMICRO 15wkINSTRUCTORS

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    Many normal flora provide direct benefits, such as making vitamins or aiding digestion. Even if normal flora microbes merely take up space and resources, they help prevent pathogens (disease causing microbes) from easily invading the body and causing illness. 

    Although there are many different species of normal flora, these microbes typically fall into one of two categories: 1. resident microbes & 2. transient microbes
    Instructor's Corner
    Continued ...
    Transient & Opportunistic Microbes 
    Go to PAGE 2 >

    See Page 2 for a comparison of transient and 
    opportunistic 
    microbes.
    Resident microbiota typically colonize the surface of the skin, mucous membranes, digestive tract, upper respiratory system and distal portion of the urogenital system. These microbes do not typically harm the host, while they benefit from feeding on the cellular waste and dead cells of the host's body.
    Arm plate of TSY agar that was used to take a normal flora sample from the skin. After incubation, plate now shows bacterial colonies of normal flora.
    Arm plate of TSY agar that was used to take a normal flora sample from the skin. After incubation, plate now shows bacterial colonies of normal flora. 
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    Prokaryotic Cell, Mariana Ruiz
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