肺炎球菌肺炎是由肺炎球菌或肺炎链球菌所引起，占院外感染肺炎中的半数以上。肺段或肺叶呈急性炎性实变，患者有寒战、高热、胸痛、咳嗽和血痰等症状。近年来由于抗菌药物的广泛应用，临床上症状轻或不典型病较为多见。肺炎球菌一般通过吸入，经上呼吸道到达肺部。它们停留在细支气管内增殖并引起炎症过程，开始在肺泡腔内产生大量蛋白质的液体，这种液体起着病菌培养介质的作用，并可帮助病菌向邻近肺泡扩散，典型的结果是导致大叶性肺炎。
肺炎球菌病是感染肺炎链球菌引起的。
Pneumococcal disease is caused by infection with the Streptococcus pneumoniae bacterium.
严重肺炎球菌性肺炎仍然发生，甚至在青年到中年人中(并非小儿和老年人)发生，死亡率为20%。
Severe pneumococcal pneumonia still occurs, even in young to middle aged persons (not just the very young and the very old) and has a mortality rate of 20%!
研究人员称，肺炎是临床疾病中最常见的与培养证实的侵袭性肺炎球菌相关，这最大程度上归因于血清型1，19A，3和7F。
Pneumonia, say the researchers, was the most common clinical disease associated with culture-confirmed invasive pneumococcal disease and this was mostly attributable to serotypes 1, 19A, 3, and 7F.
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