Abstract
Infection of the upper and lower respiratory tracts accounts for 85% of the respiratory disease seen by primary-care physicians. Acute infection is usually attributable to microbial virulence but may occur on a background of immune deficiency. Recurrent acute bronchial and pneumonic infection is associated with considerable immunological abnormality (up to 75%) for which a high index of suspicion must be maintained. Chronic bronchial sepsis, on the other hand, has a paradoxically low prevalence of immune deficiency (

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