The normal flora

The normal flora - organisms benefit one another A...

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The normal flora. The normal flora is the population of microorganisms found where the  body tissues interface with the environment. Much of the normal flora is permanent, but  some portions are transient. The transient flora is present for a time and then  disappears.  Various types of relationships exist between the normal flora and the body. The general  name of a relationship is symbiosis, a term that means living together. In some cases,  the symbiosis is further identified as a commensalism, when one organism benefits and  the other remains unaffected. A type of symbiosis called mutualism exists when both 
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Unformatted text preview: organisms benefit one another. A symbiosis called parasitism develops when one organism damages the other. Opportunistic organisms. Certain organisms of the normal flora are opportunistic. Opportunistic organisms are potentially pathogenic organisms that normally do not cause disease. However, in a compromised host, the organisms may see “opportunity” to invade the tissues. An example occurs in individuals who have AIDS. Opportunistic organisms such as Pneumocystis carinii invade the lung tissues and cause a lethal pneumonia....
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