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New molecular, cellular, and immunologic techniques used to study host–pathogen interactions have led to a reexamination of the role of infection in chronic obstructive pulmonary disease (COPD). There is now considerable evidence that infection plays a major role in the pathogenesis and clinical course of COPD. A vicious circle of infection and inflammation is thought to lead to exacerbations of the disease.
Sethi et al. (Wed,) studied this question.
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