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.
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.
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.
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