This document discusses various types of chest infections including acute bronchitis, acute exacerbation of chronic bronchitis, and community acquired pneumonia. It outlines the typical bacteria that cause these infections and recommends antibiotics for treatment. For most cases of acute bronchitis and community acquired pneumonia in previously healthy individuals, amoxicillin is recommended. Erythromycin is suggested if an atypical infection like Mycoplasma pneumoniae is suspected. Antibiotic use should be limited to cases where symptoms meet specific criteria to reduce antibiotic resistance.