Viral pneumonia

病毒性肺炎常为吸入性感染,主要传染源是病人,通过飞沫和密切接触传染,可由上呼吸道病毒感染向下蔓延引起,也可继发于出疹性病毒感染,常伴气管-支气管感染.流行性感冒病毒是成年人和老人病毒性肺炎最为常见的病原,婴幼儿病毒性肺炎则常由呼吸道合胞病毒感染所致.其他如副流感病毒、巨细胞病毒、冠状病毒、腺病毒、鼻病毒和某些肠道病毒,如柯萨奇、埃可病毒等也可引起病毒性肺炎.在非细菌性肺炎中,病毒性肺炎占25%~50%,多发生于冬春季节,可散发或流行,多见于婴幼儿、老年人和原有慢性心肺疾病的病人.近年来由于免疫抑制药物广泛应用于器官移植病人,以及爱滋病发病人数的增多,病毒性肺炎的发病率逐渐增多,而SARS的流行使得病毒性肺炎显得尤为重要.一般的病毒性肺炎临床表现大多轻微,与支原体肺炎症状相似,病程1~2周.但重症肺炎可有持续高热、心悸、气急、呼吸困难、发绀,还可伴有休克和呼吸衰竭。

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