The mixture of microorganism regularly found at any anatomical site is called 33 normal microflorae. These microorganisms often offer some protection from transient microbes, but can become 34 virulent and cause disease under certain circumstance. When they do so, they are termed 35 opportunistic pathogens. Individuals with lowered resistance are called 36 immunocompromised and they are vulnerable to such infection. The normal microflora/ flora are the groups of microbes normally present at specified anatomical sites (GIT, oral cavity, nose, skin, etc.). They provide protection by not letting other harmful bacteria/microbes grow at these sites. In immunocompromised individuals (natural immune system becomes less effective, like in patients suffering from AIDS, Tuberculosis, etc.), the normal microflora may become virulent/ pathogenic and cause disease in the host. Solution The mixture of microorganism regularly found at any anatomical site is called 33 normal microflorae. These microorganisms often offer some protection from transient microbes, but can become 34 virulent and cause disease under certain circumstance. When they do so, they are termed 35 opportunistic pathogens. Individuals with lowered resistance are called 36 immunocompromised and they are vulnerable to such infection. The normal microflora/ flora are the groups of microbes normally present at specified anatomical sites (GIT, oral cavity, nose, skin, etc.). They provide protection by not letting other harmful bacteria/microbes grow at these sites. In immunocompromised individuals (natural immune system becomes less effective, like in patients suffering from AIDS, Tuberculosis, etc.), the normal microflora may become virulent/ pathogenic and cause disease in the host..