目的 探究肺泡灌洗液靶向高通量测序（tNGS）在鹦鹉热衣原体肺炎中应用效果。方法 选取2021年5月—2025年3月我院收治的35例鹦鹉热衣原体肺炎患者进行研究，患者均接受肺泡灌洗液tNGS检测、肺泡灌洗液常规病原检测，以病原学为金标准，分析肺泡灌洗液tNGS对鹦鹉热衣原体肺炎的诊断效能。结果 金标准对鹦鹉热衣原体阳性检出35例，检出率100.00%，肺泡灌洗液tNGS阳性检出率高于传统病原检测，检测结果回报耗时短于肺泡灌洗液传统病原检测（P＜0.05）。结论 鹦鹉热衣原体肺炎临床症状缺乏特异性，容易转为重症肺炎，肺泡灌洗液tNGS可提高鹦鹉热衣原体肺炎检出率且结果回报较快，采用四环素类、喹诺酮类抗生素有助于改善患者预后。

     Objective To investigate the application effect of targeted next-generation sequencing（tNGS）of bronchoalveolar lavage fluid（BALF）in Chlamydia psittaci pneumonia．Methods Thirty-five patients with Chlamydia psittaci pneumonia admitted to our hospital from May 2021 to March 2025 were selected for the study．All patients underwent BALF tNGS and conventional BALF pathogen detection．With etiology as the gold standard，the diagnostic efficacy of BALF tNGS for Chlamydia psittaci pneumonia was analyzed．Results The gold standard detected 35 cases of Chlamydia psittaci positive，with a detection rate of 100.00%．The positive detection rate of tNGS in alveolar lavage fluid was higher than that of traditional pathogen detection，and the results report time of tNGS was shorter than that of traditional pathogen detection（P＜0.05）．Conclusions Chlamydia psittaci pneumonia lacks specificity in clinical symptoms and is easy to turn into severe pneumonia，bronchoalveolar lavage fluid tNGS can improve the detection rate of Chlamydia psittaci pneumonia and the results return quickly，and the use of tetracyclines and quinolones antibiotics can help improve the prognosis of patients．

目的 对儿童重症肺炎支气管肺泡灌洗液(BALF)进行病原学分析及疾病预后的分析。方法 本研究选取2019年3月—2020年12月在我院儿科住院并进行肺泡灌洗治疗的40例重症肺炎患儿作为研究对象。通过对这些患儿在感染急性期肺泡灌洗液中的细菌、真菌、肺炎支原体等进行病原学检查以及T 淋巴细胞亚群的检测,了解台山地区儿童重症肺炎病原体情况及耐药性、T淋巴细胞亚群与疾病严重程度、预后评估的关系。结果 BALF病原学检测结果分析中,肺炎支原体27例,肺炎支原体+肺炎链球菌5例,肺炎支原体+中间葡萄球菌2例,肺炎支原体+铅黄肠球菌1例,肺炎支原体+嗜麦芽假单胞菌2例,病原菌阴性3例;本组病例血清T细胞亚群检测结果显示:大部分病例CD3⁺、CD4⁺、CD8⁺及CD4⁺/CD8⁺水平有不同程度的下降。其中CD3⁺水平下降的有6例,CD4⁺水平下降的有16例,CD8+水平下降的有17例,CD4⁺、CD8⁺水平同时下降的有14例,CD3⁺、CD4⁺、CD8⁺水平同时下降的有4例;BALF细胞总数(3673.1±377.9)×10⁶ /L,巨噬细胞比例(23.6±17.6)%,淋巴细胞(22.1±16.2)%,中性粒细胞(46.5±24.8)%。结论 病原学分析儿童重症肺炎BALF的主要病原菌为肺炎支原体,血清T细胞亚群检测大多表现为CD4⁺、CD8⁺水平下降。

Objective To analyze the etiology of bronchoalveolar lavage fluid and prognosis of children with severe pneumonia. Methods In this study, 40 children with severe pneumonia who were hospitalized in the pediatrics department of our hospital and underwent alveolar lavage treatment from March 2019 to December 2020 were selected as the research objects. Through the detection of pathogens such as bacteria, fungi, Mycoplasma pneumoniae and T lymphocyte subsets of these children in the acute phase of infection, we can understand the pathogens and drug resistance of children with severe pneumonia in Taishan area and the relationship among drug resistance, T lymphocyte subsets and disease severity and prognosis assessment. Results In the analysis of the BALF pathogenic test results, there were 27 cases with Mycoplasma pneumoniae, 5 cases with Mycoplasma pneumoniae+Streptococcus pneumoniae, 2 cases with Mycoplasma pneumoniae+Staphylococcus intermedius, 1 case with Mycoplasma pneumoniae+Enterococcus casseliflavus, 2 cases with Mycoplasma pneumoniae+Pseudomonas maltophilia and 3 cases were pathogenic bacteria negative. The test results of serum T cell subsets of these cases showed that most of the cases had different degrees of decline in the levels of CD3⁺, CD4⁺, CD8⁺ and CD4⁺/CD8⁺. Among them, CD3⁺ levels decreased in 6 cases, CD4⁺ levels decreased in 16 cases, CD8⁺ levels decreased in 17 cases, CD4⁺ and CD8⁺ levels decreased in 14 cases, and CD3⁺, CD4⁺, and CD8⁺ levels decreased in 4 cases; total cell number of BALF was (3 673.1±377.9)×10⁶/L, the proportion of macrophages was (23.6±17.6)%, lymphocytes had (22.1±16.2)%, and neutrophils had (46.5±24.8)%. Conclusions Pathogenic analysis showed that the main pathogen of BALF in children with severe pneumonia is Mycoplasma pneumoniae, and the detection of serum T cell subsets mostly showed a decrease in CD4⁺ and CD8⁺ levels.