~ opportunistic i. — 1. Any infection that results from a defective immune system that cannot defend against pathogens normally found in the en- vironment. Common types include bacterial (Pseudomonas aeruginosa), fungal (Candida albicans), protozoan (Pneumocystis carinii), and viral (cy- tomegalovirus). Opportunistic infec- tions are seen in patients with impaired defenses against disease, such as those with cystic fibrosis, poorly controlled diabetes mellitus, acquired or con- genital immune deficiencies, or organ transplants. 2. An infection that results when resident flora proliferate and in- fect a body site in which they are nor- mally present or at some other location
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