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 bacteria is suspected or for exacerbations of chronic bronchitis. Antibiotic resistance is a growing issue so they should only be used when clearly needed.