Yahua Li1†
Jiaqing Ye2†Chenfeng Zhang2Weili Gao3Hong Zhang3Cuiying Zheng2Zhongjun Feng2Minghui Song2Jiahao Hao2
Huifen Zuo4Zhenjun Zhao4
Yumei Guo3*
Lijie Zhang2*- 1Department of Respiratory and Critical Care Medicine, Hebei Medical University Third Hospital, Shijiazhuang, China
- 2Laboratory Department, Hebei Medical University Third Hospital, Shijiazhuang, China
- 3Hebei Key Laboratory of Intractable Pathogens, Shijiazhuang Center for Disease Control and Prevention, Shijiazhuan, China
- 4Laboratory Department, Hebei Yiling Hospital, Shijiazhuan, China
To our knowledge, this is the first reported case of a pulmonary mixed infection involving Nocardia cyriacigeorgica, Stenotrophomonas maltophilia, and human cytomegalovirus (HCMV) in a patient with minimal change nephrotic syndrome (MCNS), which is of great clinical significance. We report the case of an 18-year-old male with a two-month history of MCNS who was admitted due to fever, cough, and bright red hemoptysis. Upon admission, he was treated with piperacillin/tazobactam and moxifloxacin for one week; however, the therapeutic response was suboptimal. Metagenomic Next-Generation Sequencing (mNGS) and microbiological culture of bronchoalveolar lavage fluid identified a pulmonary mixed infection involving N. cyriacigeorgica, S. maltophilia, and HCMV. Following the initiation of combination therapy with linezolid, trimethoprim-sulfamethoxazole, and ganciclovir, the patient’s condition improved markedly, and he was discharged in a stable condition. One-year follow-up revealed complete recovery with no recurrence. This case highlights the critical role of incorporating advanced molecular diagnostic tools such as mNGS into clinical practice and the need to be vigilance about opportunistic infections involving multiple pathogens, especially in patients receiving immunosuppressive therapy.
Introduction
Minimal change nephrotic syndrome (MCNS) is one of the most common causes of idiopathic nephrotic syndrome (NS) (1). Treatment typically involves the use of corticosteroids and immunosuppressants, which can induce immunosuppression and elevate the risk of opportunistic infections caused by pathogenic microbes (2). Nocardia cyriacigeorgica, Stenotrophomonas maltophilia, and human cytomegalovirus (HCMV) are opportunistic pathogens, with an increased risk of infection in patients with impaired immune function or preexisting pulmonary diseases. Co-infections involving these three pathogens are exceedingly rare, with no documented cases reported in the literature. This report describes a case of a young adult with MCNS who developed a mixed pulmonary infection involving N. cyriacigeorgica, S. maltophilia, and HCMV, identified through metagenomic next-generation sequencing (mNGS) and bacterial culture of bronchoalveolar lavage fluid (BALF). Following targeted antimicrobial therapy, the patient achieved full recovery and was discharged.
Case presentation
An 18-year-old male was admitted on September 11, 2023, presenting with fever, cough, and expectoration of bright red, blood-tinged sputum. Two months prior to admission, he had been diagnosed with MCNS and treated with methylprednisolone (40 mg once daily) and furosemide (20 mg twice daily). Upon admission, the prednisone dosage was reduced to 20 mg once daily due to severe infection and was discontinued two days later. Physical examination revealed a moon face, coarse breath sounds bilaterally, and absence of audible rales. Laboratory investigations revealed the following: 24-hour urinary protein excretion of 15.46 g/24 h, serum albumin of 20 g/L, total cholesterol of 8.85 mmol/L, triglycerides of 3.04 mmol/L, and a complete blood count showing a white blood cell (WBC) count of 15.47×109/L with a neutrophil percentage of 86.20%. High-sensitivity C-reactive protein (Hs-CRP) was elevated to 116.81 mg/L, interleukin-6 (IL-6) to 33.3 pg/mL, blood glucose to 9.82 mmol/L, erythrocyte sedimentation rate to 73 mm/h, and sputum smear demonstrated Gram-negative rods. Renal histopathology findings were consistent with MCNS. Chest computed tomography (CT) revealed a large high-density area with cavitation in the right upper lobe, along with scattered small patchy opacities and multiple small cavities in the apical segments (Figure 1A). The patient’s maximum recorded body temperature was 39.1°C. Despite one week of empirical antimicrobial therapy with piperacillin/tazobactam and moxifloxacin, the patient’s condition persisted, characterized by fever, worsening cough, decreased hemoptysis, production of small amounts of white, viscous sputum, and the onset of dyspnea. Although WBC levels decreased to 9.89×109/L, IL-6 levels increased significantly to 69.864 pg/mL, and arterial blood gas analysis indicated mild acute respiratory distress syndrome (ARDS) with an oxygenation index of 295 mmHg. Chest CT performed on September 18 revealed new diffuse multifocal patchy high-density areas and multiple cavity formations in both lungs (Figure 1B).
Figure 1. Results of Chest CT at different stages of the desease. (A) Chest CT showed a large patchy high-density lesion in the right upper lobe, associated with a large cavity. Scattered small patchy high-density lesions were also noted in the apical segment of the right upper lobe, some with small cavities. (B) Chest CT revealed the emergence of multiple diffuse, small patchy high-density lesions with poorly defined borders in both lungs, along with the development of multiple cavities. (C) Chest CT demonstrated a slight reduction in the size of the patchy high-density lesion in the right upper lobe apex compared to the prior examination. Diffuse ground-glass opacities in both lungs showed signs of absorption, with a reduction in cavity sizes. (D) Chest CT showed gradual shrinkage and closure of multiple nodules and cavities.
To identify the infectious pathogens, bedside bronchoscopy was performed on September 19. Bronchoscopic examination revealed mild mucosal congestion and edema. BALF was collected for mNGS and microbial culture. mNGS analysis identified S. maltophilia (175,079 reads, 29.1% coverage), N. cyriacigeorgica (39,897 reads, 16.6% coverage), and HCMV (6,188 reads). Microbial culture further confirmed the presence of S. maltophilia and Nocardia species in the BALF. Antimicrobial susceptibility testing for S. maltophilia demonstrated sensitivity to trimethoprim-sulfamethoxazole (TMP-SMX), levofloxacin, ticarcillin/clavulanate, ceftazidime, and minocycline. Due to the unavailability of appropriate methods, antimicrobial susceptibility testing for Nocardia was not performed. BALF smear microscopy identified modified acid-fast positive Nocardia sp. with characteristic branching and filamentous structures (Figure 2). However, no Gram-negative bacilli were observed microscopically, and it is highly probable that the 7-day empirical antimicrobial therapy prior to bronchoscopy significantly reduced the bacterial load of S. maltophilia. In summary, the diagnosis was a pulmonary mixed infection involving N. cyriacigeorgica, S. maltophilia, and HCMV in a patient with MCNS. The treatment regimen was revised to include linezolid (600 mg q12h IV) combined with TMP-SMX (SMX 400 mg + TMP 80 mg, 3 tablets q6h orally). Given the patient’s history of kidney disease and prolonged corticosteroid use, which induced immunosuppression, ganciclovir (300 mg q12h IV) was initiated for HCMV treatment, with a planned discontinuation after two weeks.
Figure 2. Direct modified acid-fast stain of BALF. Branching filaments were staining modified acid-fast positive.
After one week of treatment, the patient’s body temperature and inflammatory markers normalized, and symptoms of wheezing, dyspnea, and expectoration were markedly improved. Chest CT performed on September 25 revealed a reduction in the right lung lesion, resolution of ground-glass opacities in both lungs, and a decrease in cavity size (Figure 1C). After two weeks of intravenous linezolid and TMP-SMX therapy, both medications were switched to oral administration. Two weeks later, linezolid was discontinued, while TMP-SMX (two tablets orally every six hours) was continued. At the three-month follow-up, chest CT scans demonstrated progressive closure of multiple nodules and cavities (Figure 1D). Consequently, the TMP-SMX dosage was adjusted to a prophylactic regimen. Due to the patient’s resumption of corticosteroid therapy for NS, TMP-SMX (1 tablet q12h orally) was prescribed as a prophylactic treatment and continued thereafter. After one year of follow-up, the patient remained in stable condition with no recurrence of infection.
Discussion
MCNS represents a prevalent etiology of NS. Epidemiological studies indicate that MCNS accounts for 70%-90% of pediatric NS cases (1) and 10.9%-38.5% of adult NS instances (3, 4). The cardinal clinical features of NS encompass massive proteinuria (>3.5 g/24 h) and hypoalbuminemia (<30 g/L), potentially accompanied by edema and hyperlipidemia (5). Histopathological examination reveals essentially normal glomeruli under light microscopy with negative immunofluorescence, while electron microscopy demonstrates diffuse foot process effacement as the pathognomonic morphological feature of MCNS (1). Prednisone or its active metabolite prednisolone, is the cornerstone of early treatment for MCNS. Additionally, frequent relapses often require second-line immunosuppressants to reduce hormone dependence (1). The therapeutic use of corticosteroids and immunosuppressants, while effective, predisposes patients to immunosuppression-related complications, particularly opportunistic infections (2). Notably, PubMed records only one documented case of Nocardia infection in MCNS patients (6), with no reported instances of S. maltophilia or HCMV co-infections. This report presents the inaugural documented case of pulmonary co-infection involving N. cyriacigeorgica, S. maltophilia, and HCMV in a patient with MCNS.
N. cyriacigeorgica is an aerobic, Gram-positive, modified acid-fast positive, branching bacterium that is ubiquitously distributed in soil and aquatic environments worldwide. This pathogen can cause multi-systemic infections, most commonly affecting the lungs, brain, and skin. Pulmonary involvement constitutes the predominant site of infection, representing 62%-86% of clinical cases (5). Browne et al. reported that pulmonary infections can disseminate to the brain (7). As an opportunistic pathogen, N. cyriacigeorgica poses particular risk to NS patients due to compromised renal function, glucocorticoid therapy, and immunosuppressive treatment (5). S. maltophilia, a Gram-negative bacillus, exhibits extensive ecological distribution across soil, plant surfaces, human and animal microbiota, and hospital settings (8). Among non-fermenting bacteria, its prevalence ranks after only to Pseudomonas aeruginosa and Acinetobacter baumannii. This opportunistic pathogen primarily causes respiratory tract infections, establishing its significance as a nosocomial pathogen. HCMV (human herpesvirus 5), a double-stranded DNA virus, maintains a ubiquitous latent and persistent infection profile, with global seroprevalence rates ranging from 60% to 90% (9). While most infections remain asymptomatic or manifest mild symptoms, immunocompromised individuals face substantial risk of severe infections, organ dysfunction, and mortality. Notably, Xue et al. demonstrated that patients with HCMV pneumonia received significantly higher corticosteroid doses and more frequent immunosuppressant administration compared to HCMV-infected individuals without pneumonia (10).
In the management of N. cyriacigeorgica infections, TMP-SMX has consistently demonstrated superior efficacy as the first-line therapeutic agent (5). For severe or disseminated infections, a combination therapeutic regimen centered on TMP-SMX is recommended, supplemented by two or three different classes of additional antimicrobials, including third-generation cephalosporins (e.g., ceftriaxone, cefotaxime), carbapenems (e.g., imipenem, meropenem, ertapenem), amikacin, and linezolid (5). In the management of Stenotrophomonas maltophilia infections, the preferred initial approach typically involves a combination regimen based on TMP-SMX. It is recommended to select two antimicrobial agents with demonstrated activity (such as TMP-SMX, minocycline/tigecycline, cefiderocol, or levofloxacin) for combined therapy, maintaining this regimen until clinical improvement is achieved. For exceptional clinical scenarios—including rapid clinical deterioration, failure of alternative treatment strategies, or contraindications to other agents—a combination therapy comprising ceftazidime-avibactam and aztreonam may be considered as a therapeutic alternative (11). Regarding HCMV management, clinicians generally adopt either universal prophylaxis or preemptive therapeutic strategies. The initiation of preemptive antiviral therapy should be based on quantitative PCR detection of CMV DNAemia. Systematic research evidence indicates that setting the preemptive therapy threshold at 2–3 log10 IU/mL significantly reduces the incidence of CMV disease (12). Notably, despite the standardization of viral load reporting in international units, the establishment of a universal viral load threshold remains contentious (13). Ganciclovir is the first-line antiviral treatment for HCMV infection. Depending on clinical circumstances, either intravenous ganciclovir or oral valganciclovir may be selected for therapeutic administration, significantly reducing the risk of HCMV-related complications and enhancing clinical outcomes (14, 15).
The patient manifested a triad of clinical symptoms: persistent cough, hemoptysis, and fever with a peak temperature of 39°C. Initial empirical antimicrobial therapy consisting of piperacillin/tazobactam combined with moxifloxacin was administered for seven days. Despite this intervention, the clinical condition deteriorated precipitously, culminating in mild acute respiratory distress syndrome (ARDS). Serial lung CT imaging revealed progressive bilateral pulmonary involvement characterized by multiple patchy high-density shadows and cavitary lesions. The failure of empirical therapy to control disease progression highlighted the critical need for precise pathogen identification to guide targeted antimicrobial intervention. In this context, mNGS has emerged as an indispensable diagnostic tool, particularly for identifying rare, intractable and emerging pathogens. Consequently, BALF samples were collected for both mNGS analysis and conventional microbial culture. Both diagnostic modalities successfully identified S. maltophilia and N. cyriacigeorgica, while mNGS uniquely detected HCMV. Further clinical evaluation suggested that the patient’s prolonged glucocorticoid therapy for NS had induced a state of immunosuppression, significantly increasing vulnerability to opportunistic infections.
For the treatment of N. cyriacigeorgica and S. maltophilia, TMP-SMX represents the therapeutic cornerstone. Accordingly, a targeted antimicrobial regimen combining TMP-SMX with linezolid was initiated to optimize therapeutic efficacy and mitigate resistance development. Regarding HCMV management, while immunocompetent individuals with asymptomatic or mild infections typically do not require antiviral therapy, the patient’s two-month history of MCNS coupled with extended glucocorticoid use necessitated antiviral intervention to improve clinical outcomes. Therefore, ganciclovir (0.3 g q12h IV) was incorporated into the treatment regimen. Following two weeks of this comprehensive antimicrobial strategy, the patient demonstrated gradual temperature normalization and marked improvement in respiratory symptoms, including cough and dyspnea. Follow-up imaging studies showed resolution of bilateral diffuse patchy infiltrates and significant reduction in cavitary lesions. Concomitant decreases in inflammatory markers further confirmed the efficacy of the targeted therapeutic approach. After three months of sustained treatment, complete resolution of the pulmonary infection was achieved. Considering the ongoing steroid therapy for nephrotic syndrome, the TMP-SMX dosage was transitioned from therapeutic to prophylactic levels (1 tablet q12h orally) and maintained. At the one-year follow-up evaluation, pulmonary imaging revealed complete resolution of exudative lesions and cavitary changes, with minimal residual fibrotic strands remaining.
As an untargeted high-throughput technology, mNGS allows comprehensive pathogen detection, offering distinct advantages for diagnosing rare, emerging, and polymicrobial infections (16, 17). This case also demonstrates the perfect combination of mNGS and traditional culture technologies to help accurately capture pathogens. However, several limitations exist: First, detected nucleic acids may originate from non-viable microorganisms, as current analytical methods cannot determine microbial viability. This discrepancy may be attributed to the persistence of non-viable S. maltophilia DNA fragments post-treatment, as evidenced by negative microscopic findings despite elevated mNGS read counts in the present case. Technically, false-negative results may arise from various factors, including but not limited to NCBI database inaccuracies and/or inefficient bacterial nucleic acid release caused by suboptimal cell wall lysis protocols during sample preparation (18, 19). Furthermore, exogenous contamination and high host DNA ratios (>90%) may compromise detection reliability, necessitating remove DNA contamination from environmental microorganisms or hosts before data analysis (20, 21). Critically, clinical interpretation of microbial single-nucleotide polymorphisms (SNPs) necessitates validation via large-scale multicenter trials. Given the need for further verification of mNGS accuracy through prospective studies and its substantial cost (22), conventional methods (e.g., PCR, serology) remain first-line for definitive pathogen identification. mNGS is optimally employed when: (1) conventional tests contradict strong clinical suspicion, or (2) rare/novel pathogen screening is required (22).
This case illustrates a rare pulmonary co-infection involving N. cyriacigeorgica, S. maltophilia, and potential HCMV infection, highlighting the critical need for comprehensive diagnostic strategies in immunocompromised patients with poor response to empirical antimicrobial therapy. The integrated application of imaging studies, conventional bacterial culture, and advanced mNGS technology enables accurate pathogen identification and facilitates targeted therapeutic interventions, ultimately enhancing clinical management and patient outcomes.
Data availability statement
The original contributions presented in the study are included in the article/supplementary material. Further inquiries can be directed to the corresponding authors.
Ethics statement
Written informed consent was obtained from the individual(s) for the publication of any potentially identifiable images or data included in this article. Written informed consent was obtained from the participant/patient(s) for the publication of this case report.
Author contributions
YL: Writing – original draft, Writing – review & editing. JY: Writing – original draft, Writing – review & editing. CfZ: Writing – review & editing, Writing – original draft. WG: Writing – original draft, Writing – review & editing. HZ: Writing – review & editing, Writing – original draft. CyZ: Writing – review & editing, Writing – original draft. ZF: Writing – original draft, Writing – review & editing. MS: Writing – review & editing, Writing – original draft. JH: Writing – review & editing, Writing – original draft. HZ: Writing – original draft, Writing – review & editing. ZZ: Writing – review & editing, Writing – original draft. YG: Writing – original draft, Writing – review & editing. LZ: Writing – review & editing, Writing – original draft.
Funding
The author(s) declare that no financial support was received for the research and/or publication of this article.
Acknowledgments
We thank the medical and nursing team for treatment and care of the patients.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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Keywords: metagenomic next-generation sequencing, pulmonary infection, Nocardia cyriacigeorgica, Stenotrophomonas maltophilia, human cytomegalovirus, minimal change nephrotic syndrome
Citation: Li Y, Ye J, Zhang C, Gao W, Zhang H, Zheng C, Feng Z, Song M, Hao J, Zuo H, Zhao Z, Guo Y and Zhang L (2025) Case Report: Pulmonary mixed infection by Nocardia cyriacigeorgica, Stenotrophomonas maltophilia, and human cytomegalovirus in a patient with minimal change nephrotic syndrome. Front. Immunol. 16:1599958. doi: 10.3389/fimmu.2025.1599958
Received: 25 March 2025; Accepted: 02 May 2025;
Published: 26 May 2025.
Edited by:
Anis Rageh Al-Maleki, University of Malaya, MalaysiaReviewed by:
Tuhin Kumar Guha, Stanford University, United StatesWeston Browne, Mercy General Hospital, United States
Copyright © 2025 Li, Ye, Zhang, Gao, Zhang, Zheng, Feng, Song, Hao, Zuo, Zhao, Guo and Zhang. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Lijie Zhang, emhhbmdsaWppZUBoZWJtdS5lZHUuY24=; Yumei Guo, MzI1MDY5Njc1QHFxLmNvbQ==
†These authors have contributed equally to this work and share first authorship