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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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- Fall '07