[Antibiotic therapy for exacerbation].

Bacterial infections are involved in approximately 50% of acute exacerbations of chronic bronchitis (AECB). Pneumococci, Haemophilus influenzae and Moraxella catarrhalis are the main pathogens. Studies using quantitative cultures and molecular typing suggest a causal relationship between bacterial infection and exacerbation. Furthermore, an association between infection and bronchial inflammation has been demonstrated. In contrast to steroid therapy and non-invasive ventilation, the benefits of antibiotic treatment are not well established. Current guidelines recommend antimicrobial therapy for AECB in type I exacerbations, for patients needing ventilatory support and for patients with cardiac comorbidity. Bacterial eradication is able to prolong the infection free interval.