Pneumococcal pneumonia

According to some investigations, the most common pathogens are Streptococcus pneumoniae types 1, 2, 3, 4, 6, 7, 8, 12, 14, 18, and 19, and children are 1, 6, 14, 18, 19, and 23 For more. Carriers are the main source of infection, and the role of the patient's source of infection is minimal. The germs are excreted through nasopharyngeal secretions and spread as droplets. Dense populations have occasional outbreaks, and are generally distributed by multiple lines. Diseases occur in all seasons, but more in winter and spring. More men than women. Secondary pneumonia is more common in children, elderly and chronic patients. There is a defensive barrier in the upper respiratory tract of normal people, so it is not easy to be infected. Once the barrier is impaired, defensive function can become ill. For example, upper respiratory tract virus infection can increase mucus secretion, inhibit ciliary epithelium function and phagocytosis. Anesthesia can weaken epiglottic reflex and cause aspiration of gastric contents and nasopharyngeal bacteria secretion. Heart failure, septic shock, chest injury can make The accumulation of water in the alveoli, bronchial cancer, bronchiectasis, and lung abscesses can cause bronchial obstruction and poor drainage, which can induce the disease.