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Zhang M, Zhang H, Yan B, Ren M, Wang W, Zhang T. Diagnostic performance of matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS) in bronchoalveolar lavage fluid for pulmonary tuberculosis in HIV-infected patients. J Clin Tuberc Other Mycobact Dis 2024; 36:100459. [PMID: 38983443 PMCID: PMC11231557 DOI: 10.1016/j.jctube.2024.100459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/11/2024] Open
Abstract
Introduction Pulmonary tuberculosis (PTB) remains a significant health concern, particularly in individuals infected with human immunodeficiency virus (HIV) who are more susceptible to developing active TB disease. Early and accurate diagnosis of TB is crucial for effective treatment and prevention of transmission. This study aims to evaluate the potential of matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOFMS) analysis of bronchoalveolar lavage fluid (BALF) for diagnosis of suspected PTB in HIV-infected patients. Methods This retrospective study recruited 60 HIV-infected patients with suspected PTB presenting with respiratory symptoms and abnormal chest radiographs between January 2022 and June 2023. BALF samples were collected and subjected to analysis using MALDI-TOF MS, GeneXpert, acid-fast bacilli (AFB) smear and culture. And their diagnostic performance was compared. Results The sensitivity of MALDI⁃TOFMS for diagnosing PTB was 83.3 %, which was better than that of smear 11.9 %, culture 40.5 % or Xpert38.1 % (all p < 0.01). The area under the curve (AUC) value of MALDI⁃TOFMS was 0.889, which was better than that of smear 0.532, culture 0.675 or Xpert 0.690 (all p < 0.01). The katG315 and rpoB-RRDR 511 mutations were detected by the MALDI⁃TOFMS in two patients. Conclusion Nucleotide MALDI-TOFMS has a good clinical performance for rapid diagnosis of PTB from BALF samples in HIV infected patients, and detects mutations of TB simultaneously.
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Affiliation(s)
- Mei Zhang
- Department of Infectious Diseases and Medical Immunology, Beijing Youan Hospital, Capital Medical University, Beijing 100069, China
| | - Hongwei Zhang
- Clinic of Center for Infection, Beijing Youan Hospital, Capital Medical University, Beijing 100069, China
| | - Benyong Yan
- Department of Infectious Diseases and Medical Immunology, Beijing Youan Hospital, Capital Medical University, Beijing 100069, China
| | - Meixin Ren
- Department of Infectious Diseases and Medical Immunology, Beijing Youan Hospital, Capital Medical University, Beijing 100069, China
| | - Wen Wang
- Department of Infectious Diseases and Medical Immunology, Beijing Youan Hospital, Capital Medical University, Beijing 100069, China
| | - Tong Zhang
- Department of Infectious Diseases and Medical Immunology, Beijing Youan Hospital, Capital Medical University, Beijing 100069, China
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Ghafari S, Alavi SM, Khaghani S. Potentially pathogenic culturable bacteria in hemodialysis waters. BMC Microbiol 2024; 24:276. [PMID: 39054498 PMCID: PMC11270894 DOI: 10.1186/s12866-024-03430-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2023] [Accepted: 07/16/2024] [Indexed: 07/27/2024] Open
Abstract
BACKGROUND Hemodialysis patients are at risk of acquiring healthcare-related infections due to using non-sterile water to prepare hemodialysis fluid. Therefore, microbiological control and monitoring of used water are of crucial importance. MATERIALS AND METHODS In this work, we identified bacterial populations occupying a hemodialysis water distribution system for almost a 6-month period in Ahvaz city, southwest of Iran. A total of 18 samples from three points were collected. We found high colony counts of bacteria on R2A agar. 31 bacteria with different morphological and biochemical characteristics were identified by molecular-genetic methods based on 16 S rRNA gene sequencing. Endotoxin concentrations were measured, using Endosafe® Rapid LAL Single-Test Vials. RESULTS A diverse bacterial community was identified, containing predominantly Gram-negative bacilli. The most frequently isolated genus was Sphingomonas. Five species including M. fortuitum, M. lentiflavum, M.szulgai, M. barrassiae, and M. gordonae was identified .Despite the presence of Gram-negative bacteria the endotoxin analysis of all samples revealed that their endotoxin values were below the detection limit. CONCLUSION The members of Sphingomonas genus along with Bosea and mycobacteria could be regarded as pioneers in surface colonization and biofilm creation. These bacteria with others like Pelomonas, Bradyrhizobium, staphylococcus, and Microbacterium may represent a potential health risk to patients under hemodialysis treatment.
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Affiliation(s)
- Shokouh Ghafari
- Cellular and Molecular Research Center, Faculty of Medicine, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - Seyed Mohammad Alavi
- Infectious and Tropical Diseases Research Center, Health Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran
| | - Soheila Khaghani
- Infectious and Tropical Diseases Research Center, Health Research Institute, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
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Bandeira L, Faria C, Cavalcante F, Mesquita A, Martins C, Martins S. Metabarcoding expands knowledge on diversity and ecology of rare actinobacteria in the Brazilian Cerrado. Folia Microbiol (Praha) 2024:10.1007/s12223-024-01184-x. [PMID: 38961050 DOI: 10.1007/s12223-024-01184-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2023] [Accepted: 06/17/2024] [Indexed: 07/05/2024]
Abstract
Rare and unknown actinobacteria from unexplored environments have the potential to produce new bioactive molecules. This study aimed to use 16 s rRNA metabarcoding to determine the composition of the actinobacterial community, particularly focusing on rare and undescribed species, in a nature reserve within the Brazilian Cerrado called Sete Cidades National Park. Since this is an inaccessible area without due legal authorization, it is understudied, and, therefore, its diversity and biotechnological potential are not yet fully understood, and it may harbor species with groundbreaking genetic potential. In total, 543 operational taxonomic units (OTUs) across 14 phyla were detected, with Actinobacteria (41.2%), Proteobacteria (26.5%), and Acidobacteria (14.3%) being the most abundant. Within Actinobacteria, 107 OTUs were found, primarily from the families Mycobacteriaceae, Pseudonocardiaceae, and Streptomycetaceae. Mycobacterium and Streptomyces were the predominant genera across all samples. Seventeen rare OTUs with relative abundance < 0.1% were identified, with 82.3% found in only one sample yet 25.5% detected in all units. Notable rare and transient genera included Salinibacterium, Nocardia, Actinomycetospora_01, Saccharopolyspora, Sporichthya, and Nonomuraea. The high diversity and distribution of Actinobacteria OTUs indicate the area's potential for discovering new rare species. Intensified prospection on underexplored environments and characterization of their actinobacterial diversity could lead to the discovery of new species capable of generating innovative natural products.
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Affiliation(s)
- Leonardo Bandeira
- Ecology and Natural Resources, Federal University of Ceará, Fortaleza, Brazil.
- Graduate Course of Ecology and Natural Resources, Department of Biology, Campus of Pici, Federal University of Ceará, Fortaleza, 60440-900, Brazil.
| | | | - Fernando Cavalcante
- Ecology and Natural Resources, Federal University of Ceará, Fortaleza, Brazil
| | - Ariel Mesquita
- Biotechnology of Natural Resources, Federal University of Ceará, Fortaleza, Brazil
| | - Claudia Martins
- Graduate Course of Ecology and Natural Resources, Department of Biology, Campus of Pici, Federal University of Ceará, Fortaleza, 60440-900, Brazil
| | - Suzana Martins
- Graduate Course of Ecology and Natural Resources, Department of Biology, Campus of Pici, Federal University of Ceará, Fortaleza, 60440-900, Brazil
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Santos A, Carneiro S, Silva A, Gomes JP, Macedo R. Nontuberculous Mycobacteria in Portugal: Trends from the last decade. Pulmonology 2024; 30:337-343. [PMID: 35219623 DOI: 10.1016/j.pulmoe.2022.01.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 01/24/2022] [Accepted: 01/25/2022] [Indexed: 11/25/2022] Open
Abstract
INTRODUCTION AND OBJECTIVES Nontuberculous mycobacteria (NTM) are opportunistic human pathogens found in the environment. The transmission seems to be associated with inhalation of aerosol droplets, ingestion or trauma events. Recent studies indicate that NTM disease is increasing worldwide, however, the true clinical impact of NTM infections is difficult to determine due to challenges in discriminating between disease and colonization as they are ubiquitous in the environment. In addition, understanding the epidemiology of NTM is difficult and has not yet been established. In this work, we used a country NTM representative collection from the National Reference Laboratory for Tuberculosis (NRL-TB) of the National Institute of Health (INSA), to characterize the circulation trends of NTM species in Portugal and the most affected regions, contributing to a better understanding of the NTM epidemiology. MATERIAL AND METHODS We conducted a nationwide retrospective study where all individuals with positive NTM cultures at the NRL-TB of the INSA from 2014 to December 2020 were included. Positive cultures were identified using GenoType Mycobacterium CM/AS® (Hain Lifescience) according to manufacturer's instructions, or hsp65 DNA sequencing as previously described. Social-demographic data from patients were also analyzed and patients classified into 3 groups according only to microbiological data, "definite NTM disease", "NTM colonization" and, "possible NTM disease". RESULTS In the period 2014-2020, the NRL-TB performed 50397 cultures. Among these, 1118 cultures were NTM positive retrieved from 944. Most of our cases were in patients whose mean age was 64±15.9 years, and no significant differences between gender was observed, although more frequent in male patients. Overall, from the 944 cases, we were able to identified 93 "definite NTM disease" cases and 79 "possible NTM disease". Mycobacterium avium complex (MAC) (40,8%), Mycobacterium abscessus-chelonae complex (MABC) (9,6%) and Mycobacterium fortuitum (6,3%) were responsible for most of the infections. The geographical distribution of NTM cases varied significantly and was possible to observe that was independent of population density. The region were most cases occurred was Lisbon Metropolitan Area (31,9%), followed by North (25,3%) and Centre (24,4%), however North region has the highest number of "definite NTM disease" cases (n=33). CONCLUSIONS This is the first national wide epidemiological study on this subject, contributing to a better understanding of NTM dynamics in Portugal. MAC was the NTM species responsible for the majority of infections and, LMA the region with the highest number of cases. It was also possible to conclude that the number of NTM isolates is independent of the demography of the region.
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Affiliation(s)
- A Santos
- National Reference Laboratory for Mycobacteria, Dept of Infectious Diseases, National Institute of Health, Lisbon, Portugal
| | - S Carneiro
- National Reference Laboratory for Mycobacteria, Dept of Infectious Diseases, National Institute of Health, Lisbon, Portugal; Department of Life Sciences, NOVA School of Science and Technology, NOVA University Lisbon, Caparica, Portugal
| | - A Silva
- National Reference Laboratory for Mycobacteria, Dept of Infectious Diseases, National Institute of Health, Porto, Portugal
| | - J P Gomes
- Bioinformtics Unit, National Institute of Health, Lisbon, Portugal
| | - R Macedo
- National Reference Laboratory for Mycobacteria, Dept of Infectious Diseases, National Institute of Health, Lisbon, Portugal.
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Elanjian AI, Law JP, Hrinczenko B. Mycobacterium gordonae Infection in a Patient With Non-small Cell Lung Cancer. Cureus 2024; 16:e54689. [PMID: 38524070 PMCID: PMC10960623 DOI: 10.7759/cureus.54689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/22/2024] [Indexed: 03/26/2024] Open
Abstract
Mycobacterium gordonae (MG) is one of the least pathogenic nontuberculous mycobacteria (NTM). We report an unusual case of MG infection in a patient with newly diagnosed lung cancer. A 61-year-old woman presented with shortness of breath and weight loss. Six months prior to admission, she was diagnosed with MG infection based on positive sputum cultures and bronchioalveolar lavage. Despite anti-mycobacterial therapy, her symptoms worsened and she lost approximately 100 pounds. A transbronchial biopsy obtained one week prior to admission revealed adenocarcinoma of the lung. At admission, vital signs were normal, and a physical exam revealed bilateral crackles. Computed tomography (CT) scan of the chest revealed infiltrates with ground-glass opacity. The patient was admitted to the oncology service for evaluation. Our findings suggest that symptomatic individuals with positive cultures of MG should proceed with extensive workup for possible underlying lung cancer especially if not responding to anti-mycobacterial therapy.
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Affiliation(s)
- Alissa I Elanjian
- Medical Education, Michigan State University College of Human Medicine, East Lansing, USA
| | - Jason P Law
- Internal Medicine, Michigan State University College of Human Medicine, East Lansing, USA
| | - Borys Hrinczenko
- Oncology, Michigan State University College of Human Medicine, East Lansing, USA
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Wang Y, Xu Q, Xu B, Lin Y, Yang X, Tong J, Huang C. Clinical performance of nucleotide MALDI-TOF-MS in the rapid diagnosis of pulmonary tuberculosis and drug resistance. Tuberculosis (Edinb) 2023; 143:102411. [PMID: 37748279 DOI: 10.1016/j.tube.2023.102411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 09/17/2023] [Accepted: 09/20/2023] [Indexed: 09/27/2023]
Abstract
OBJECTIVE To evaluate the application value of nucleotide matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS) technology in the rapid diagnosis of pulmonary tuberculosis (PTB) and its drug resistance. METHODS From February 2021 to January 2022, respiratory specimens from 214 suspected PTB patients at the First Hospital of Quanzhou were collected. Nucleotide MALDI-TOF-MS and BACTEC MGIT 960 culture methods were used for the detection of Mycobacterium tuberculosis (MTB) and drug resistance to anti-tuberculosis drugs. RESULTS Compared with culture method, nucleotide MALDI-TOF-MS technology had a sensitivity, specificity, and accuracy of 92.2%, 74.1%, and 82.7%, respectively, for the detection of MTB in respiratory specimens. With clinical diagnosis as the reference standard, the sensitivity and accuracy of nucleotide MALDI-TOF-MS were 82.5% and 86.0%, respectively, which were higher than those of the culture method (69.2% and 78.0%, respectively). The specificity of nucleotide MALDI-TOF-MS was 93.0%, which was slightly lower than that of culture method (95.8%). As for drug resistance, the results of nucleotide MALDI-TOF-MS exhibited good consistence with culture methods for rifampin, isoniazid, ethambutol, and streptomycin. CONCLUSION Nucleotide MALDI-TOF-MS detection has a good clinical performance for rapid detection of MTB and drug sensitivity to rifampin, isoniazid, ethambutol, and streptomycin directly on respiratory specimens.
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Affiliation(s)
- Yuyuan Wang
- Department of Pulmonary and Critical Care Medicine, The First Hospital of Quanzhou Affiliated to Fujian Medical University, Quanzhou, Fujian, China.
| | - Qinghua Xu
- Department of Pulmonary and Critical Care Medicine, The First Hospital of Quanzhou Affiliated to Fujian Medical University, Quanzhou, Fujian, China.
| | - Bailan Xu
- Department of Pulmonary and Critical Care Medicine, The First Hospital of Quanzhou Affiliated to Fujian Medical University, Quanzhou, Fujian, China.
| | - Yichuan Lin
- Department of Pulmonary and Critical Care Medicine, The First Hospital of Quanzhou Affiliated to Fujian Medical University, Quanzhou, Fujian, China.
| | - Xia Yang
- Department of Pulmonary and Critical Care Medicine, The First Hospital of Quanzhou Affiliated to Fujian Medical University, Quanzhou, Fujian, China.
| | - Jingfeng Tong
- Shanghai Conlight Medical Co., Ltd, Shanghai, China.
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Yan M, Brode SK, Marras TK. Treatment of the Less Common Nontuberculous Mycobacterial Pulmonary Disease. Clin Chest Med 2023; 44:799-813. [PMID: 37890917 DOI: 10.1016/j.ccm.2023.06.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/29/2023]
Abstract
Nontuberculous mycobacterial pulmonary disease caused by the less common nontuberculous mycobacteria have distinct features depending on the species. Diagnostic evaluation follows the established criteria for all nontuberculous mycobacteria, but with certain qualifications given species-specific and regional differences in pathogenicity. Clinicians should first institute nonpharmacologic management and evaluate clinical, radiologic, and microbiologic factors in the decision regarding antimycobacterial therapy. Treatment is challenging, and evidence-based recommendations are limited for most species. Drug susceptibility testing is used to help with regimen selection; however, this approach is imperfect given the uncertain correlation between in vitro activity and clinical response for most drugs.
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Affiliation(s)
- Marie Yan
- Department of Medicine, University of Toronto, Toronto, Ontario, Canada; Clinician Investigator Program, University of British Columbia, Suite 200 City Square East Tower South, 555 West 12th Avenue, Vancouver, British Columbia V5Z 3X7, Canada
| | - Sarah K Brode
- Department of Medicine, University of Toronto, Toronto, Ontario, Canada; Division of Respirology, University Health Network, Toronto, Ontario, Canada; Division of Respiratory Medicine, West Park Healthcare Centre, 82 Buttonwood Avenue, Toronto, Ontario M6M 2J5, Canada
| | - Theodore K Marras
- Department of Medicine, University of Toronto, Toronto, Ontario, Canada; Division of Respirology, University Health Network, Toronto, Ontario, Canada.
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Yuanchun L, Wenping Z, Jing Z, Wenjie L, Yanlin Z, Yanming L, Jiuxin Q. Mycobacterium paragordonae is an emerging pathogen in human pulmonary disease: clinical features, antimicrobial susceptibility testing and outcomes. Emerg Microbes Infect 2022; 11:1973-1981. [PMID: 35916253 PMCID: PMC9364734 DOI: 10.1080/22221751.2022.2103453] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Objectives: Mycobacterium paragordonae (MPG) is an emerging and less common type of Non-tuberculous mycobacteria (NTM) and we know little about its characteristics and prognosis, hence we constructed this retrospective cohort study. Methods: MPG was identified using MALD-TOF MS, multi-target combined gene sequencing and WGS. Clinical information was collected, antimicrobial susceptibility testing was measured using the SLOMYCO panel, and optimal growth temperature testing was measured using Lowenstein-Jensen medium. Results: Eight MPGs were isolated from 1730 NTMs (0.46%); the mean age of MPG pulmonary disease (MPG-PD) patients was 42.38 ± 9.92 years, 37.5% were male, and the average BMI was 18.4 ± 0.51 kg/m2. All patients had the symptoms of cough and sputum and CT images mainly presented in patchy or streaky shadows, MPG grew at 25°C, 30°C and 37°C, and the optimal growth temperature is 37°C. MPGs were sensitive to clarithromycin, rifabutin, amikacin, linezolid, moxifloxacin, cotrimoxazole and ciprofloxacin, two isolates were resistant to rifampicin. Two patients had follow up information, their imaging remained stable during the follow-up. Conclusions: MPG-PD is a rare NTM disease and is more likely to develop in middle-aged, female, and low BMI patients. The patients present with no specific features within the symptoms as well as the CT imaging. The optimal growth temperature of MPG is at 37°C, MPG-PD has excellent sensitivity to drugs recommended by CLSI and presents with a stable disease.
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Affiliation(s)
- Li Yuanchun
- Department of Clinical Laboratory, The Third People's Hospital of Shenzhen, Southern University of Science and Technology, National Clinical Research Center for Infectious Diseases, Guangdong Provincial Clinical Research Center for Infectious Diseases (Tuberculosis), Shenzhen Clinical Research Center for Tuberculosis, Shenzhen, China
| | - Zhang Wenping
- Department of Clinical Laboratory, The Third People's Hospital of Shenzhen, Southern University of Science and Technology, National Clinical Research Center for Infectious Diseases, Guangdong Provincial Clinical Research Center for Infectious Diseases (Tuberculosis), Shenzhen Clinical Research Center for Tuberculosis, Shenzhen, China
| | - Zhao Jing
- Department of Medical Imaging, The Third People's Hospital of Shenzhen, Southern University of Science and Technology, National Clinical Research Center for Infectious Diseases, Guangdong Provincial Clinical Research Center for Infectious Diseases (Tuberculosis), Shenzhen Clinical Research Center for Tuberculosis, Shenzhen, China
| | - Lai Wenjie
- Department of Clinical Laboratory, The Third People's Hospital of Shenzhen, Southern University of Science and Technology, National Clinical Research Center for Infectious Diseases, Guangdong Provincial Clinical Research Center for Infectious Diseases (Tuberculosis), Shenzhen Clinical Research Center for Tuberculosis, Shenzhen, China
| | - Zhao Yanlin
- National Tuberculosis Reference Laboratory, Chinese Center for Disease Control and Prevention. Beijing, P.R. China
| | - Li Yanming
- Department of Pulmonary and Critical Care Medicine, Beijing Hospital, National Center of Gerontology, National Health Commission; Institute of Geriatric Medicine, Chinese Academy of Medical Sciences, Beijing, P.R. China
| | - Qu Jiuxin
- Department of Clinical Laboratory, The Third People's Hospital of Shenzhen, Southern University of Science and Technology, National Clinical Research Center for Infectious Diseases, Guangdong Provincial Clinical Research Center for Infectious Diseases (Tuberculosis), Shenzhen Clinical Research Center for Tuberculosis, Shenzhen, China
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Lange C, Böttger EC, Cambau E, Griffith DE, Guglielmetti L, van Ingen J, Knight SL, Marras TK, Olivier KN, Santin M, Stout JE, Tortoli E, Wagner D, Winthrop K, Daley CL, Lange C, Andrejak C, Böttger E, Cambau E, Griffith D, Guglielmetti L, van Ingen J, Knight S, Leitman P, Marras TK, Olivier KN, Santin M, Stout JE, Tortoli E, Wagner D, Wallace RJ, Winthrop K, Daley C. Consensus management recommendations for less common non-tuberculous mycobacterial pulmonary diseases. THE LANCET INFECTIOUS DISEASES 2022; 22:e178-e190. [DOI: 10.1016/s1473-3099(21)00586-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2021] [Revised: 07/08/2021] [Accepted: 09/01/2021] [Indexed: 12/18/2022]
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Surgical site infections by atypical mycobacteria: prevalence and species characterization using MALDI-TOF and molecular LCD chip array. Infection 2022; 50:1557-1563. [PMID: 35716342 PMCID: PMC9705499 DOI: 10.1007/s15010-022-01864-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2022] [Accepted: 05/24/2022] [Indexed: 11/05/2022]
Abstract
BACKGROUND Surgical site infection (SSI) is a post-operative complication of high concern with adverse impact on patient prognosis and public health systems. Recently, SSI pathogens have experienced a change in microbial profile with increasing reports of non-tuberculous mycobacteria (NTM) as important pathogens. AIM of the study The study aimed to detect the prevalence of NTM among cases with SSIs and describe their species using matrix-assisted laser desorption ionization time of flight mass spectrometry (MALDI-TOF MS) and PCR-based microarray. METHODS The study was conducted with 192 pus samples collected from patients with SSI. Mycobacterial investigations were done in the form of Ziehl-Neelsen (ZN) smears for acid-fast bacilli, automated mycobacterial culture to isolate mycobacteria, followed by immunochromatography test to predict NTM. NTM-positive cultures were tested by MALDI -TOF MS and PCR-based microarray to reach species-level identification. RESULTS Mycobacterial growth was found in 11/192 samples (5.7%) and identified as 4 NTM and 7 M. tuberculosis isolates with prevalence of 2.1% and 3.64%, respectively. The NTM species were described by MALDI-TOF as M. abscessus, M. porcinum, M. bacteremicum, and M. gordonae. Microarray agreed with MALDI-TOF in identifying one isolate (M. abscessus), while two isolates were classified as belonging to broad groups and one isolate failed to be identified. CONCLUSIONS The prevalence of NTM among SSI was found to be low, yet have to be considered in the diagnosis of mycobacteria. Employing advanced technologies in diagnosis is recommended to guide for appropriate treatment.
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Abstract
PURPOSE OF REVIEW The aim of this article is to review the most recent evidences concerning mycobacterial skin infections, limiting the period of literature research to 2020--2021. RECENT FINDINGS Mycobacterial skin infections include a heterogeneous group of cutaneous diseases.Cutaneous tuberculosis is usually the result of hematogenous dissemination or spread from underlying foci and it must be distinguished from tuberculids, resulting from the immunological reaction to Mycobacterium tuberculosis antigens. Leprosy prevalence was drastically reduced after introduction of multidrug therapy in the 1980 s, but cases are still reported due to underdiagnosis, and animal and environmental reservoirs. Recent advances concentrate in the diagnostic field. Specific guidelines for the treatment of nontuberculous mycobacteria skin infections are missing and surgical procedures may be required. Prognosis is better as compared to nontuberculous mycobacteria lung disease. Rapid laboratory-confirmed diagnosis of Buruli ulcer may be achieved by the IS2404 PCR. Among new drugs, telacebec is promising in terms of potency, shorter duration and tolerability in animal studies. A clinical trial in humans is planned. SUMMARY Mycobacterial cutaneous lesions are nonpathognomonic and clinical suspicion must be confirmed by culture or molecular detection. Long-course multidrug treatment is required based on susceptibility tests. Surgical intervention may also be required. Rehabilitation and psychosocial support reduce long-term physical and mental consequences mostly in Buruli ulcer and leprosy.
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Gaballah A, Ghazal A, Almiry R, Emad R, Sadek N, Abdel Rahman M, El-Sherbini E. Simultaneous Detection of Mycobacterium tuberculosis and Atypical Mycobacteria by DNA-Microarray in Egypt. Med Princ Pract 2022; 31:246-253. [PMID: 35413718 PMCID: PMC9274830 DOI: 10.1159/000524209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Accepted: 03/17/2022] [Indexed: 11/26/2022] Open
Abstract
BACKGROUND AND OBJECTIVES Immunocompromised patients are a high-risk group for developing mycobacterial infections with either pulmonary and/or extrapulmonary diseases. Low-cost/density DNA-microarray is considered an easy and efficient method for the detection of typical and atypical mycobacterial species. MATERIALS AND METHODS Thirty immunocompromised patients were recruited to provide their clinical specimens (sputum, serum, urine, and lymph node aspirates). Real-time polymerase chain reaction (PCR) and DNA-microarray techniques were performed and compared to the conventional methods of Ziehl-Neelsen staining and Lowenstein Jensen culturing. RESULTS Mycobacterium tuberculosis complex was detected in all 30 clinical specimens (100% sensitivity) by real-time PCR and DNA-microarray. Additionally, coinfection with 4 atypical species belonging to nontuberculous mycobacteria was identified in 7 sputum specimens. These atypical mycobacterial species were identified as M. kansasii 10% (n = 3), M. avium complex 6.6% (n = 2), M. gordanae 3.3% (n = 1), and M. peregrinum 3.3% (n = 1). CONCLUSION This study documents the presence of certain species of atypical mycobacteria among immunocompromised patients in Egypt.
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Affiliation(s)
- Ahmed Gaballah
- Microbiology Department, Medical Research Institute, Alexandria University, Alexandria, Egypt
- *Ahmed Gaballah,
| | - Abeer Ghazal
- Microbiology Department, Medical Research Institute, Alexandria University, Alexandria, Egypt
| | - Reda Almiry
- Clinical Pathology Department, Military Academy of Medicine, Alexandria Armed Forces Hospital, Alexandria, Egypt
| | - Rasha Emad
- Clinical Pharmacy, Alexandria Main University Hospital, Alexandria University, Alexandria, Egypt
| | - Nadia Sadek
- Hematology Department, Medical Research Institute, Alexandria University, Alexandria, Egypt
| | - Mohamed Abdel Rahman
- Clinical Pathology Department, Military Academy of Medicine, Alexandria Armed Forces Hospital, Alexandria, Egypt
| | - Eglal El-Sherbini
- Microbiology Department, Medical Research Institute, Alexandria University, Alexandria, Egypt
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Nguyen I, Green ON, Modahl L. Nontuberculous Mycobacterial Pulmonary Disease: A Clinical and Radiologic Update. Semin Roentgenol 2022; 57:75-89. [DOI: 10.1053/j.ro.2021.10.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Revised: 10/22/2021] [Accepted: 10/22/2021] [Indexed: 11/11/2022]
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