儿童肺炎衣原体肺炎研究进展

Research Progress of Chlamydia pneumoniae Pneumonia in Children

摘要: 肺炎衣原体(Chlamydia pneumoniae, C. pneumoniae)是儿童非典型社区获得性肺炎的重要病原体。其专性细胞内寄生、双相发育周期及可逆性持续状态，使感染呈隐匿起病、病程迁延、病原检出受采样时机影响以及抗菌药物清除不完全等特点。近年来我国及东亚地区儿童肺炎衣原体肺炎(Chlamydia pneumoniae pneumonia, CPP)出现明显回升，患儿以学龄期儿童为主，但婴幼儿、免疫功能低下和有基础疾病者亦可发生重症。CPP临床表现缺乏特异性，持续咳嗽较常见，影像学可表现为肺实变、胸膜下团块样影、晕轮征、支气管充气征及间质性改变；混合感染十分常见。病原诊断应以核酸扩增试验为核心，结合配对血清学、下呼吸道标本、影像学和病程综合判读，单次血清IgG阳性或治疗后短期PCR持续阳性均不能独立证明活动性感染。治疗以大环内酯类为首选，同时重视支持治疗、混合感染覆盖与抗菌药物管理；持续发热或进展性肺实变者需重新评估病原、并发症和非感染性疾病，而非简单延长或叠加抗菌药物。本文从病原生物学、流行病学、宿主免疫与微生物组、临床表型、诊断技术、治疗及远期影响等方面综述儿童CPP研究进展，并提出未来应加强多中心主动监测、统一诊断标准、开展药代或药效和随机对照研究以及推动疫苗与宿主靶向治疗转化。

Abstract: Chlamydia pneumoniae is an important cause of atypical community-acquired pneumonia in children. Its obligate intracellular lifestyle, biphasic developmental cycle, and reversible persistent phenotype contribute to an insidious onset, prolonged clinical course, time-dependent pathogen detection, and incomplete microbiological eradication. Recent studies from China and other East Asian regions have demonstrated a marked resurgence of pediatric C. pneumoniae pneumonia, predominantly among school-aged children, while infants and immunocompromised children remain vulnerable to severe disease. Clinical and radiological findings are non-specific, and coinfection is frequent. Nucleic acid amplification tests should serve as the cornerstone of etiological diagnosis and must be interpreted together with specimen type, timing, paired serology, imaging findings, and clinical evolution. Macrolides remain the first-line antimicrobial agents, but supportive care, assessment for coinfection and complications, and antimicrobial stewardship are equally important. This review summarizes advances in pathogen biology, epidemiology, host immunity and microbiome, clinical phenotypes, diagnostic technologies, treatment, long-term consequences, prevention, and future research priorities of pediatric C. pneumoniae pneumonia.