Home Medicine Identification of mixed anaerobic infections after inguinal hernia repair based on metagenomic next-generation sequencing: A case report
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Identification of mixed anaerobic infections after inguinal hernia repair based on metagenomic next-generation sequencing: A case report

  • Jun Zhang , Yuming Zhou , Zhenzhou Zhong , Yan Lv , Xuying Yang and Xianghong Liu EMAIL logo
Published/Copyright: January 12, 2024

Abstract

Infection following inguinal hernia repair (IHR) is uncommon. Rational use of antibiotics can significantly improve the prognosis of patients. However, accurately identifying the pathogen involved is usually challenging. This case report describes a patient who developed intermittent fever after undergoing open preperitoneal tension-free repair of a bilateral inguinal hernia. The scrotal fluid specimen was cultured and subjected to metagenomic next-generation sequencing (mNGS). Culture revealed the presence of Enterococcus faecalis (a facultative anaerobe). However, mNGS detected E. faecalis along with multiple anaerobic bacteria including Bacteroides thetaiotaomicron, Parabacteroides distasonis, and Levyella massiliensis. The patient was finally diagnosed with a mixed infection of E. faecalis and multiple anaerobes, and his condition was effectively controlled after timely adjustment of the antibiotic regimen. Treating postoperative infections with multiple concurrent conditions can be challenging. mNGS is valuable for the accurate diagnosis and treatment of infections, as it not only can further verify the culture results, but also assist clinicians in ruling out pulmonary infection caused by hematogenous dissemination after IHR in patients.

1 Introduction

Inguinal hernia is a common surgical condition, and its repair is the most common general surgical procedure, with studies showing an annual surgical rate of approximately 0.2% in the United States [1]. Inguinal hernia repair (IHR) surgery can be performed using both suture-based and mesh-based techniques and can be open or minimally invasive [2]. Currently, the vast majority of IHR repair tissue procedures are performed by placing a tension-free synthetic mesh [3]. Studies have shown that the postoperative infection rate in IHR ranges from 2.4 to 4.9% [4,5]. IHR infections are usually caused by Staphylococcus spp., Enterococcus spp., and gram-negative bacteria. Although infection is infrequent, it is very severe once it occurs [6]. Staphylococcus spp. and gram-negative bacteria are always considered in clinical empirical medication [7]. Timely and accurate diagnosis of infectious pathogens becomes crucial for a successful postoperative recovery.

In this case, a patient who underwent an open preperitoneal tension-free repair of a bilateral inguinal hernia presented with persistent, intermittent fever 5 days after surgery with negative scrotal effusion culture. Seven days later, scrotal effusion was obtained again and sent for culture, meanwhile metagenomic next-generation sequencing (mNGS) was performed 2 days later, both of which detected Enterococcus faecalis, while the mNGS also detected Bacteroides thetaiotaomicron, Parabacteroides distasonis, and Levyella massiliensis. The antibiotic regimen was adjusted accordingly, and the patient’s condition improved.

2 Case presentation

On November 20, 2019 (10 days before admission to our hospital), a 72-year-old male patient was admitted to a local hospital for bilateral inguinal hernias and underwent open tension-free repair surgery without complications. The patient had a previous history of cerebral infarction with left limb dysfunction. Five days after the surgery, the patient developed left-sided chest pain with fever, cough, and copious white sputum. Chest computed tomography (CT) indicated bilateral lung infection and pleural effusions. Despite treatment with anti-infective and antiasthmatic medications, the chest pain persisted.

On December 1, 2019, the patient was transferred to our hospital for further treatment. Physical examination showed normal vital signs, clear mind, and normal thorax. Bilateral breath sounds were coarse with a small amount of moist rales. The patient had surgical incisions (5 cm) in the bilateral inguinal regions, which appeared swollen, red, and painful. Re-examination of chest and abdominal CT (Figure 1) revealed bilateral lung infections, bilateral pleural effusions, abnormal shadows in bilateral scrotum and inguinal regions, calcification in the aortic wall and coronary wall, multiple stones in the right kidney, and suspected hyperplasia in the left adrenal gland.

Figure 1 
               CT scan of the patient chest.
Figure 1

CT scan of the patient chest.

The blood gas analysis revealed a pH of 7.51 and a partial pressure of oxygen of 43 mmHg. The procalcitonin (PCT) level was 0.87 ng/mL (normal range: 0–0.5 ng/mL), indicating an elevated value. The C-reactive protein level was 237.9 mg/L (normal range: 0–6.0 mg/L), indicating a significantly elevated value. The blood routine examination indicated a high white blood cell (WBC) count of 21.88 × 109/L (normal range: 3.5–9.5 × 109/L), with neutrophils accounting for 90.50% (normal range: 40–75%). Additionally, the patient had low levels of red blood cells (3.53 × 1012/L) and hemoglobin (111 g/L). The liver function, electrolytes, coagulation function, and other biochemical examinations showed mild abnormalities. Based on these findings, the initial clinical diagnosis was pulmonary infection with pulmonary embolism, type I respiratory failure, and infection after bilateral IHR.

On the following day after admission (December 2), the patient underwent a color Doppler ultrasonography, which suggested scrotal effusion, but an abscess could not be ruled out. Culture using scrotal effusion (yellowish) after puncture was negative. Empirical antibiotic therapy conducted with piperacillin sodium and tazobactam sodium (4.5/0.5 g equivalent every 8 h by intravenous drip) in combination with linezolid (600 mg every 8 h by intravenous drip) were given. However, the condition continued to worsen.

On Day 5 after admission (December 5), color Doppler ultrasonography re-examination revealed scrotal and inguinal edema, which might be caused by large omentum and hernia contents. Smear using scrotal fluid after another puncture was still negative. During this period, the patient still had fever, WBC (18.07 × 109/L) and PCT (0.59 ng/mL) were lower than before. Scrotal swelling diminished in size, especially on the right side. The antibiotic regimen continued.

On Day 9 (December 9), the third scrotal color Doppler ultrasonography revealed mixed echogenic masses in the scrotum bilaterally, inflammatory masses could not be excluded, and mild syringomyelia bilaterally. The patient underwent puncture of scrotal effusion. The fluid was soy sauce colored with a foul odor. Culture was performed using Columbia Blood Agar and China Blue Agar at 37℃ for 5 × 24 h, indicating E. faecalis (December 12). The results of the antibiotic susceptibility tests indicated that ampicillin, gentamicin, teicoplanin, rifampicin, vancomycin, ciprofloxacin, furantoin, and linezolid are effective against the isolates, but tetracycline showed resistance. Meanwhile, blood and scrotal effusion were sent for mNGS (Hugobiotech, Beijing, China) on December 11 (Day 11), both of which revealed L. massiliensis, B. thetaiotaomicron, P. distasonis, and E. faecalis (Figure 2a–i). Polymerase chain reaction (PCR) using scrotal effusion confirmed the mNGS detection, while blood PCR only detected L. massiliensis (Figure 3). The detailed mNGS process can be found in Yu et al. [8]. Accordingly, the treatment regimen was adjusted to ampicillin (3 g every 6 h by intravenous drip) combined with ciprofloxacin (0.4 g every 12 h by intravenous drip). The patient’s symptoms gradually improved (Figure 4). He was discharged on January 14, 2020).

Figure 2 
               Results of mNGS using scrotal fluid and blood. (a–d) The genome coverage of detected P. distasonis, L. massiliensis, B. thetaiotaomicron, and E. faecalis by mNGS using scrotal fluid was 3.61, 6.75, 4.76, and 0.68%, respectively. (e and f) The detected specific reads number and the percentage of each pathogen by mNGS using scrotal fluid and blood in this patient. (g and h) The genome coverage of detected P. distasonis, L. massiliensis, and B. thetaiotaomicron by mNGS using blood was 0.07, 0.04 and 0.03%, respectively.
Figure 2

Results of mNGS using scrotal fluid and blood. (a–d) The genome coverage of detected P. distasonis, L. massiliensis, B. thetaiotaomicron, and E. faecalis by mNGS using scrotal fluid was 3.61, 6.75, 4.76, and 0.68%, respectively. (e and f) The detected specific reads number and the percentage of each pathogen by mNGS using scrotal fluid and blood in this patient. (g and h) The genome coverage of detected P. distasonis, L. massiliensis, and B. thetaiotaomicron by mNGS using blood was 0.07, 0.04 and 0.03%, respectively.

Figure 3 
               PCR results of L. massiliensis, B. thetaiotaomicron, and P. distasonis using hydrocele and blood in this patient. L. massiliensis was positive in both hydrocele and blood. B. thetaiotaomicron and P. distasonis were positive in hydrocele but negative in blood. The PCR amplification primers (target 16S) for B. thetaiotaomicron were 5ʹ-GCAAACTGGAGATGGCGA-3ʹ (Forward) and 5ʹ-AAGGTTTGGTGAGCCGTTA-3ʹ (Reverse) with amplified fragment of 197 bp. The PCR amplification primers (target 16S) for P. distasonis were 5ʹ-AATACCGCATGAAGCAGG-3ʹ (Forward) and 5′-GACACGTCCCGCACTTTA-3′ (Reverse) with amplified fragment of 301 bp. The PCR amplification primers (target 16S) for L. massiliensis were 5′-TAGGTGTCGGGTGTCAAAGC-3′ (Forward) and 5′-CCTGGTAAGGTTCTTCGCGT-3′ (Reverse) with amplified fragment of 159 bp. PCR amplification conditions were 94℃, 5 min; 40 cycles (94℃, 30 s; 53℃, 30 s; 72℃, 30 s); 72℃, 5 min. NTC in the image refers to no template control.
Figure 3

PCR results of L. massiliensis, B. thetaiotaomicron, and P. distasonis using hydrocele and blood in this patient. L. massiliensis was positive in both hydrocele and blood. B. thetaiotaomicron and P. distasonis were positive in hydrocele but negative in blood. The PCR amplification primers (target 16S) for B. thetaiotaomicron were 5ʹ-GCAAACTGGAGATGGCGA-3ʹ (Forward) and 5ʹ-AAGGTTTGGTGAGCCGTTA-3ʹ (Reverse) with amplified fragment of 197 bp. The PCR amplification primers (target 16S) for P. distasonis were 5ʹ-AATACCGCATGAAGCAGG-3ʹ (Forward) and 5′-GACACGTCCCGCACTTTA-3′ (Reverse) with amplified fragment of 301 bp. The PCR amplification primers (target 16S) for L. massiliensis were 5′-TAGGTGTCGGGTGTCAAAGC-3′ (Forward) and 5′-CCTGGTAAGGTTCTTCGCGT-3′ (Reverse) with amplified fragment of 159 bp. PCR amplification conditions were 94℃, 5 min; 40 cycles (94℃, 30 s; 53℃, 30 s; 72℃, 30 s); 72℃, 5 min. NTC in the image refers to no template control.

Figure 4 
               Progression diagram of the patient’s condition.
Figure 4

Progression diagram of the patient’s condition.

  1. Consent to publish: Written informed consent was obtained from the patient for publication of this case report and any accompanying images. A copy of the written consent is available for review by the Editor of this journal upon request.

  2. Statement of informed consent obtained: Informed written consent has been obtained from the patient and can be provided at any time upon request.

3 Discussion and conclusions

IHR surgery carries associated postoperative risks, including prolonged pain, bleeding, nerve injury, peripheral vascular injury, and damage to adjacent organs, and most urgently, resolution of postoperative infection. Clinically, pathogens should be identified by culture in the diagnosis of postoperative infection. However, because the results of the culture method are often false negative, doctors sometimes have to consider empirical medication. Culture method is the gold standard testing for pathogen identification, but it is time-consuming and misses some pathogens, such as anaerobes [9,10]. Current culture techniques in the clinic have low detection efficacy for anaerobes [11]. Postoperative infections are often acute and rapidly progressive, and culture is clearly not the most appropriate method of diagnosis.

In this case, the patient was discharged after adjusting the antibiotic regimen according to the mNGS results (from piperacillin sodium and tazobactam sodium in combination with linezolid to ampicillin combined with ciprofloxacin). The results illustrate that pathogens in this patient were rare and culture was limited for clinical identification of anaerobes. As an unbiased, culture-free method compared to culture, mNGS identifies a comprehensive range of pathogens, including rare ones, and provide a full view of a patient’s infection. The patient’s specimen was not sent for mNGS at the same time as the first scrotal effusion culture, which might have caused some delay in the precise medication of postoperative infection.

Pathogens were detected in scrotal effusion and blood by culture, PCR, and especially mNGS detection. The clinicians took into account the patient’s clinical features in combination with various clinical factors to exclude pulmonary infection caused by hematogenous dissemination. Although early empirical treatment did not bring clinical benefits for postoperative infection, piperacillin sodium and tazobactam sodium combined with linezolid for anti-infection also played a certain role in controlling pulmonary infection. Subsequently, a mixed postoperative infection with E. faecalis and anaerobes was clinically judged based on the foul odor of the scrotal fluid drainage. B. thetaiotaomicron, P. distasonis, L. massiliensis, and E. faecalis are important bacteria in human gut. Consider the previous IHR of this patient, the origin of these causative bacteria might be from gut.

The coexistence of multiple conditions makes the diagnosis and treatment of postoperative infection for the patient quite difficult. mNGS is important for the accurate diagnosis and treatment of diseases. By timely adjustment of the antibiotic regimen and puncture drainage, the patient’s condition was effectively controlled and was discharged from the hospital eventually.

Abbreviations

CT

computed tomography

CTA

CT angiography

IHR

inguinal hernia repair

mNGS

metagenomic next-generation sequencing

PCR

polymerase chain reaction

PCT

procalcitonin

WBC

white blood cell

Acknowledgements

The authors would like to thank all members of the co-author, patient, Hugobiotech Co., Ltd, involved in this article.

  1. Funding information: The Science and Technology Project of Xi’an (No. 21RGSF0013) has given financial support to this article.

  2. Author contributions: Z.J. and L.X. designed and drafted the article. Z.Y. and Z.Z. involved in the clinical care and management of the patients. L.Y. and Y.X. analyzed the mNGS data. All authors approved the final manuscript as submitted and agree to be accountable for all aspects of the work.

  3. Conflict of interest: Author Yan Lv and Xuying Yang are employed by Hugobiotech Co., Ltd. The remaining 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.

  4. Data availability statement: The datasets presented in this study can be found in National Genomics Data Center (https://www.cncb.ac.cn/), accession no. OMIX939.

References

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Received: 2023-07-30
Revised: 2023-12-01
Accepted: 2023-12-07
Published Online: 2024-01-12

© 2024 the author(s), published by De Gruyter

This work is licensed under the Creative Commons Attribution 4.0 International License.

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  129. Long intergenic noncoding RNA for IGF2BP2 stability suppresses gastric cancer cell apoptosis by inhibiting the maturation of microRNA-34a
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  131. Parental control attitudes over their pre-school children’s diet
  132. The role of auto-HSCT in extranodal natural killer/T cell lymphoma
  133. Significance of negative cervical cytology and positive HPV in the diagnosis of cervical lesions by colposcopy
  134. Echinacoside inhibits PASMCs calcium overload to prevent hypoxic pulmonary artery remodeling by regulating TRPC1/4/6 and calmodulin
  135. ADAR1 plays a protective role in proximal tubular cells under high glucose conditions by attenuating the PI3K/AKT/mTOR signaling pathway
  136. The risk of cancer among insulin glargine users in Lithuania: A retrospective population-based study
  137. The unusual location of primary hydatid cyst: A case series study
  138. Intraoperative changes in electrophysiological monitoring can be used to predict clinical outcomes in patients with spinal cavernous malformation
  139. Obesity and risk of placenta accreta spectrum: A meta-analysis
  140. Shikonin alleviates asthma phenotypes in mice via an airway epithelial STAT3-dependent mechanism
  141. NSUN6 and HTR7 disturbed the stability of carotid atherosclerotic plaques by regulating the immune responses of macrophages
  142. The effect of COVID-19 lockdown on admission rates in Maternity Hospital
  143. Temporal muscle thickness is not a prognostic predictor in patients with high-grade glioma, an experience at two centers in China
  144. Luteolin alleviates cerebral ischemia/reperfusion injury by regulating cell pyroptosis
  145. Therapeutic role of respiratory exercise in patients with tuberculous pleurisy
  146. Effects of CFTR-ENaC on spinal cord edema after spinal cord injury
  147. Irisin-regulated lncRNAs and their potential regulatory functions in chondrogenic differentiation of human mesenchymal stem cells
  148. DMD mutations in pediatric patients with phenotypes of Duchenne/Becker muscular dystrophy
  149. Combination of C-reactive protein and fibrinogen-to-albumin ratio as a novel predictor of all-cause mortality in heart failure patients
  150. Significant role and the underly mechanism of cullin-1 in chronic obstructive pulmonary disease
  151. Ferroptosis-related prognostic model of mantle cell lymphoma
  152. Observation of choking reaction and other related indexes in elderly painless fiberoptic bronchoscopy with transnasal high-flow humidification oxygen therapy
  153. A bibliometric analysis of Prader-Willi syndrome from 2002 to 2022
  154. The causal effects of childhood sunburn occasions on melanoma: A univariable and multivariable Mendelian randomization study
  155. Oxidative stress regulates glycogen synthase kinase-3 in lymphocytes of diabetes mellitus patients complicated with cerebral infarction
  156. Role of COX6C and NDUFB3 in septic shock and stroke
  157. Trends in disease burden of type 2 diabetes, stroke, and hypertensive heart disease attributable to high BMI in China: 1990–2019
  158. Purinergic P2X7 receptor mediates hyperoxia-induced injury in pulmonary microvascular endothelial cells via NLRP3-mediated pyroptotic pathway
  159. Investigating the role of oviductal mucosa–endometrial co-culture in modulating factors relevant to embryo implantation
  160. Analgesic effect of external oblique intercostal block in laparoscopic cholecystectomy: A retrospective study
  161. Elevated serum miR-142-5p correlates with ischemic lesions and both NSE and S100β in ischemic stroke patients
  162. Correlation between the mechanism of arteriopathy in IgA nephropathy and blood stasis syndrome: A cohort study
  163. Risk factors for progressive kyphosis after percutaneous kyphoplasty in osteoporotic vertebral compression fracture
  164. Predictive role of neuron-specific enolase and S100-β in early neurological deterioration and unfavorable prognosis in patients with ischemic stroke
  165. The potential risk factors of postoperative cognitive dysfunction for endovascular therapy in acute ischemic stroke with general anesthesia
  166. Fluoxetine inhibited RANKL-induced osteoclastic differentiation in vitro
  167. Detection of serum FOXM1 and IGF2 in patients with ARDS and their correlation with disease and prognosis
  168. Rhein promotes skin wound healing by activating the PI3K/AKT signaling pathway
  169. Differences in mortality risk by levels of physical activity among persons with disabilities in South Korea
  170. Review Articles
  171. Cutaneous signs of selected cardiovascular disorders: A narrative review
  172. XRCC1 and hOGG1 polymorphisms and endometrial carcinoma: A meta-analysis
  173. A narrative review on adverse drug reactions of COVID-19 treatments on the kidney
  174. Emerging role and function of SPDL1 in human health and diseases
  175. Adverse reactions of piperacillin: A literature review of case reports
  176. Molecular mechanism and intervention measures of microvascular complications in diabetes
  177. Regulation of mesenchymal stem cell differentiation by autophagy
  178. Molecular landscape of borderline ovarian tumours: A systematic review
  179. Advances in synthetic lethality modalities for glioblastoma multiforme
  180. Investigating hormesis, aging, and neurodegeneration: From bench to clinics
  181. Frankincense: A neuronutrient to approach Parkinson’s disease treatment
  182. Sox9: A potential regulator of cancer stem cells in osteosarcoma
  183. Early detection of cardiovascular risk markers through non-invasive ultrasound methodologies in periodontitis patients
  184. Advanced neuroimaging and criminal interrogation in lie detection
  185. Maternal factors for neural tube defects in offspring: An umbrella review
  186. The chemoprotective hormetic effects of rosmarinic acid
  187. CBD’s potential impact on Parkinson’s disease: An updated overview
  188. Progress in cytokine research for ARDS: A comprehensive review
  189. Utilizing reactive oxygen species-scavenging nanoparticles for targeting oxidative stress in the treatment of ischemic stroke: A review
  190. NRXN1-related disorders, attempt to better define clinical assessment
  191. Lidocaine infusion for the treatment of complex regional pain syndrome: Case series and literature review
  192. Trends and future directions of autophagy in osteosarcoma: A bibliometric analysis
  193. Iron in ventricular remodeling and aneurysms post-myocardial infarction
  194. Case Reports
  195. Sirolimus potentiated angioedema: A case report and review of the literature
  196. Identification of mixed anaerobic infections after inguinal hernia repair based on metagenomic next-generation sequencing: A case report
  197. Successful treatment with bortezomib in combination with dexamethasone in a middle-aged male with idiopathic multicentric Castleman’s disease: A case report
  198. Complete heart block associated with hepatitis A infection in a female child with fatal outcome
  199. Elevation of D-dimer in eosinophilic gastrointestinal diseases in the absence of venous thrombosis: A case series and literature review
  200. Four years of natural progressive course: A rare case report of juvenile Xp11.2 translocations renal cell carcinoma with TFE3 gene fusion
  201. Advancing prenatal diagnosis: Echocardiographic detection of Scimitar syndrome in China – A case series
  202. Outcomes and complications of hemodialysis in patients with renal cancer following bilateral nephrectomy
  203. Anti-HMGCR myopathy mimicking facioscapulohumeral muscular dystrophy
  204. Recurrent opportunistic infections in a HIV-negative patient with combined C6 and NFKB1 mutations: A case report, pedigree analysis, and literature review
  205. Letter to the Editor
  206. Letter to the Editor: Total parenteral nutrition-induced Wernicke’s encephalopathy after oncologic gastrointestinal surgery
  207. Erratum
  208. Erratum to “Bladder-embedded ectopic intrauterine device with calculus”
  209. Retraction
  210. Retraction of “XRCC1 and hOGG1 polymorphisms and endometrial carcinoma: A meta-analysis”
  211. Corrigendum
  212. Corrigendum to “Investigating hormesis, aging, and neurodegeneration: From bench to clinics”
  213. Corrigendum to “Frankincense: A neuronutrient to approach Parkinson’s disease treatment”
  214. Special Issue The evolving saga of RNAs from bench to bedside - Part II
  215. Machine-learning-based prediction of a diagnostic model using autophagy-related genes based on RNA sequencing for patients with papillary thyroid carcinoma
  216. Unlocking the future of hepatocellular carcinoma treatment: A comprehensive analysis of disulfidptosis-related lncRNAs for prognosis and drug screening
  217. Elevated mRNA level indicates FSIP1 promotes EMT and gastric cancer progression by regulating fibroblasts in tumor microenvironment
  218. Special Issue Advancements in oncology: bridging clinical and experimental research - Part I
  219. Ultrasound-guided transperineal vs transrectal prostate biopsy: A meta-analysis of diagnostic accuracy and complication rates
  220. Assessment of diagnostic value of unilateral systematic biopsy combined with targeted biopsy in detecting clinically significant prostate cancer
  221. SENP7 inhibits glioblastoma metastasis and invasion by dissociating SUMO2/3 binding to specific target proteins
  222. MARK1 suppress malignant progression of hepatocellular carcinoma and improves sorafenib resistance through negatively regulating POTEE
  223. Analysis of postoperative complications in bladder cancer patients
  224. Carboplatin combined with arsenic trioxide versus carboplatin combined with docetaxel treatment for LACC: A randomized, open-label, phase II clinical study
  225. Special Issue Exploring the biological mechanism of human diseases based on MultiOmics Technology - Part I
  226. Comprehensive pan-cancer investigation of carnosine dipeptidase 1 and its prospective prognostic significance in hepatocellular carcinoma
  227. Identification of signatures associated with microsatellite instability and immune characteristics to predict the prognostic risk of colon cancer
  228. Single-cell analysis identified key macrophage subpopulations associated with atherosclerosis
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