Metagenomic next-generation sequencing in diagnosing Pneumocystis jirovecii pneumonia: A case report

• Published in: Open life sciences Vol. 17; no. 1; pp. 938 - 943
• Main Authors: Zhang, Yuan, Zeng, Zhaoshang, Li, Fenghui, Peng, Zhiyun, Xia, Han, Zeng, Yunyi, Chen, Haimin, Wang, Yingjing, Xie, Weining, Zhang, Yanhua, Tang, Zhongxiang
• Format: Journal Article
• Language: English
• Published: De Gruyter 17.08.2022
• Subjects: blood serum; Case Report; case studies; computed tomography; diagnosis; DNA; early diagnosis; glass; metagenomic next-generation sequencing; metagenomics; mortality; opacity; patients; Pneumocystis; pneumocystis jirovecii pneumonia; pneumonia; prognosis; quantitative polymerase chain reaction; rheumatoid arthritis; sulfamethoxazole; trimethoprim; women
• ISSN: 2391-5412; 2391-5412
• DOI: 10.1515/biol-2022-0094

It remains a huge challenge for clinicians to diagnose pneumonia (PJP) by a conventional method, which leads to delay in diagnosing PJP, accounting for higher mortality in patients with rheumatoid arthritis (RA). A 69-year-old woman, who suffered from RA for years, developed acute respiratory failure. The computed tomography scan showed diffused effusion and ground glass opacity in both lungs, which could not be differentiated from interstitial pneumonia. Metagenomic next-generation sequencing (mNGS) revealed in both serum and bronchoalveolar lavage fluid with reads per million (RPM) of 17 and 437, while other diagnostic tests did not detect any pathogenic microorganism. The results were verified by quantitative polymerase chain reaction (mtSSU region) against the same samples. The DNA RPM of declined notably after treatment with trimethoprim/sulfamethoxazole. The patient was discharged without treatment and finally passed away. This case fully highlights the sensitivity of mNGS in early diagnosis of PJP, which is of great significance for prognosis and treatment. Nonetheless, the clinical application of mNGS is worth further standardization and normalization.