80年代,肺炎球菌仍为肺部感染最常见的致病菌。本文扼要介绍国外有关肺炎球菌感染的流行病学研究进展。带菌状况肺炎球菌为专性寄生菌,常在人鼻咽部寄生,偶尔,其他哺乳动物也可带菌。在人鼻咽部,该菌为共生菌。仅当该菌进入下呼吸道和其他部位,或穿过鼻咽部粘膜经颈淋巴管进入体循环时才能引起疾病。 In the 1980s, pneumococcus was still the most common pathogen of lung infection. This article briefly introduced foreign epidemiological research on pneumococcal infection. Pneumococcal bacteria carrying status of obligate parasites, often in human nasopharyngeal parasitic, and occasionally, other mammals can also carry bacteria. In human nasopharynx, the bacteria is a symbiotic bacteria. Only when the bacteria into the lower respiratory tract and other parts, or through the nasopharyngeal mucosa through the cervical lymphatic into systemic circulation can cause disease.