目的提高对卡氏肺囊虫肺炎（PCP）的认识，探索电镜对卡氏肺囊虫肺炎的诊断意义以及预防PCP的方法。
Objective To improve the understanding of pneumocystis carinii pneumonia (PCP) and investigate the role of electron microscopical examination in the diagnosis of PCP.
由于包括卡式肺囊虫肺炎在内的其他呼吸道感染，在HIV病毒感染者身上很常见，医生在使用某些抗生素前必须对诊断结果确认无疑。
Because other forms of respiratory infection including PCP are common among HIV-infected people, doctors must be certain of diagnosis before administering antibiotics.
这些感染通常会被健康的免疫系统所抵御，但是较低的CD4细胞计数意味着某些机会感染，例如卡式肺囊虫肺炎（肺炎的一种），可以危及生命。
These infections would usually be fought off by a healthy immune system, but a low CD4 cell count means opportunistic infections such as PCP (a type of pneumonia) can be life-threatening.
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