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Non-tuberculous mycobacteria

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https://www.readbyqxmd.com/read/29773279/-non-tuberculous-mycobacterial-cervical-adenitis-in-children-2-cases
#1
N Sigg, S Bailleul, J-M Turmel, G Legrand, S Kettani, L Martin
BACKGROUND: Cervical lymphadenitis is the most common manifestation of infection with nontuberculous mycobacteria (NTM) in immunocompetent children. Nevertheless, it is poorly known by dermatologists. Its incidence, which is currently increasing since the cessation of BCG vaccination in 2007, raises several issues regarding its pathophysiology, diagnosis and management. PATIENTS AND METHODS: We report two cases of NTM adenitis: one in a 2-year-old girl vaccinated with BCG and one in an unvaccinated 22-month-old boy, in whom a misleading presentation led to delayed diagnosis...
May 14, 2018: Annales de Dermatologie et de Vénéréologie
https://www.readbyqxmd.com/read/29773092/preliminary-study-on-drug-susceptibility-profile-and-resistance-mechanisms-to-macrolides-of-clinical-isolates-of-non-tuberculous-mycobacteria-from-china
#2
Fu Li, Gui Lian Li, Hui Pang, Hai Can Liu, Tong Yang Xiao, Shuang Jun Li, Qiao Luo, Yi Jiang, Rui Bai Wang, Kang Lin Wan
OBJECTIVE: Macrolide susceptibility and drug resistance mechanisms of clinical non-tuberculous mycobacteria (NTM) isolates were preliminarily investigated for more accurate diagnosis and treatment of the infection in China. METHODS: Four macrolides, including clarithromycin (CLAR), azithromycin (AZM), roxithromycin (ROX), and erythromycin (ERY), were used to test the drug susceptibility of 310 clinical NTM isolates from six provinces of China with the broth microdilution method...
April 2018: Biomedical and Environmental Sciences: BES
https://www.readbyqxmd.com/read/29760399/publisher-correction-non-tuberculous-mycobacteria-isolated-from-pulmonary-samples-in-sub-saharan-africa-a-systematic-review-and-meta-analyses
#3
Catherine Okoi, Suzanne T B Anderson, Martin Antonio, Sarah N Mulwa, Florian Gehre, Ifedayo M O Adetifa
A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has been fixed in the paper.
May 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29760127/-in-vitro-activity-of-clofazimine-against-non-tuberculous-mycobacteriaisolated-in-beijing-china
#4
Jingjing Luo, Xia Yu, Guanglu Jiang, Yuhong Fu, Fengmin Huo, Yifeng Ma, Fen Wang, Yuanyuan Shang, Qian Liang, Yi Xue, Hairong Huang
Due to the natural resistance of non-tuberculous mycobacteria(NTM) to lots of antibiotics,treatment of diseases caused by NTM is often long-termed but less successful.The main goal of this study was to evaluate the in vitro susceptibility to clofazimine of 209 isolates consisting of different NTM species isolated in Beijing,China. Furthermore,47 reference strains were also tested, including 30 rapidly growing mycobacterium (RGM) species and 17 slowly growing mycobacterium(SGM) species.The potential molecular mechanism contributing to clofazimine resistance of NTM was investigated as well...
May 14, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29754381/non-tuberculous-mycobacterial-infections-in-thoracic-transplant-candidates-and-recipients
#5
REVIEW
Mana Rao, Fernanda P Silveira
PURPOSE OF REVIEW: To review and discuss the epidemiology, risk factors, clinical presentation, diagnosis, and treatment of non-tuberculous mycobacteria (NTM) in thoracic transplantation. RECENT FINDINGS: Non-tuberculous mycobacteria are ubiquitous but are an uncommon cause of disease after solid organ transplantation. The incidence of infection is higher in thoracic transplant recipients than in abdominal transplant recipients, with most cases seen after lung transplantation...
May 12, 2018: Current Infectious Disease Reports
https://www.readbyqxmd.com/read/29740544/establishment-of-a-host-to-host-transmission-model-for-mycobacterium-avium-subsp-hominissuis-using-caenorhabditis-elegans-and-identification-of-colonization-associated-genes
#6
Luiz E Bermudez, Sasha J Rose, Jamie L Everman, Navid R Ziaie
Mycobacterium avium subsp. hominissuis ( M. avium ) is a member of the non-tuberculous mycobacteria (NTM), and is a common cause of lung infection in patients with chronic NTM lung conditions. M. avium is an environmental bacterium believed to be transmitted from environmental sources. In this work we used a recently developed model in Caenorhabditis elegans to ask whether M. avium can be transmitted from host-to-host, and the bacterial genes associated with host colonization. Infection of C. elegans was carried out by placing the nematode in cultured with M...
2018: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29735762/two-dd-carboxypeptidases-from-mycobacterium-smegmatis-affect-cell-surface-properties-through-regulation-of-peptidoglycan-cross-linking-and-glycopeptidolipids
#7
Satya Deo Pandey, Shilpa Pal, Ganesh Kumar N, Ankita Bansal, Sathi Mallick, Anindya S Ghosh
During the peptidoglycan (PG) maturation of mycobacteria, the glycan strands are interlinked by both 3-3 (between two meso-DAP) and 4-3 cross-links (between D-ala and meso-DAP), though there is a predominance (60-80%) of 3-3 cross-links. The DD-CPases act on pentapeptides to generate tetrapeptides that are used by LD-transpeptidases as substrates to form 3-3 cross-links. Therefore, DD-CPases play a crucial role in mycobacterial PG cross-link formation. However, the physiology of DD-CPases in mycobacteria is relatively unexplored...
May 7, 2018: Journal of Bacteriology
https://www.readbyqxmd.com/read/29729715/non-tuberculous-mycobacteria-can-cause-disseminated-mycobacteriosis-in-cats
#8
H Pekkarinen, N Airas, L E Savolainen, M Rantala, S Kilpinen, O Miuku, M Speeti, V Karkamo, S Malkamäki, M Vaara, A Sukura, P Syrjä
Mycobacteriosis caused by non-tuberculous mycobacteria (NTM) is a rising concern in human medicine both in immunocompromised and immunocompetent patients. In cats, mycobacteriosis caused by NTM is considered mostly to be a focal or dermal infection, with disseminated disease mostly caused by Mycobacterium avium. We describe three cases of disseminated mycobacteriosis in cats, caused by Mycobacterium malmoense, Mycobacterium branderi/shimoidei and M. avium, with no identified underlying immunosuppression. In all cases, extracellular mycobacteria were seen in the pulmonary epithelium, intestinal lumen and glomerular tufts, which could affect the shedding of the organism...
April 2018: Journal of Comparative Pathology
https://www.readbyqxmd.com/read/29712660/novel-mutations-associated-with-clofazimine-resistance-in-mycobacterium-abscessus
#9
Yuanyuan Chen, Jiazhen Chen, Shuo Zhang, Wanliang Shi, Wenhong Zhang, Min Zhu, Ying Zhang
Mycobacterium abscessus ( Mab ) is a major non-tuberculous mycobacterial (NTM) pathogen responsible for about 80% of all pulmonary infections caused by rapidly growing mycobacteria. Clofazimine is an effective drug active against Mab , but the mechanism of resistance to clofazimine in Mab is unknown. To investigate the molecular basis of clofazimine resistance in Mab. We isolated 29 Mab mutants resistant to clofazimine, and subjected them to whole genome sequencing to identify possible mutations associated with clofazimine resistance...
April 30, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29702266/genome-sequence-of-mycobacterium-yongonense-rt-955-2015-isolate-from-a-patient-misdiagnosed-with-multi-drug-resistant-tuberculosis-first-clinical-isolate-in-tanzania
#10
Nicholaus Peter Mnyambwa, Dong-Jin Kim, Esther Ngadaya, Jongsik Chun, Sung-Min Ha, Pammla Petrucka, Kennedy Kwasi Addo, Rudovick R Kazwala, Sayoki G Mfinanga
BACKGROUND: Mycobacterium yongonense is a recently described novel species belonging to Mycobacterium avium complex which is the most prevalent etiology of non-tuberculous mycobacteria associated with pulmonary infections, and posing tuberculosis diagnostic challenges in high-burden, resource-constrained settings. METHODS: We used whole genome shotgun sequencing and comparative microbial genomic analyses to characterize the isolate from a patient diagnosed with multi-drug resistant tuberculosis (MDR-TB) after relapse...
April 24, 2018: International Journal of Infectious Diseases: IJID
https://www.readbyqxmd.com/read/29687767/growth-characteristics-of-liquid-cultures-increase-the-reliability-of-presumptive-identification-of-mycobacterium-tuberculosis-complex
#11
Juliana Maira Watanabe Pinhata, Isis Moreira Felippe, Juliana Failde Gallo, Erica Chimara, Lucilaine Ferrazoli, Rosangela Siqueira de Oliveira
We evaluated the microscopic and macroscopic characteristics of mycobacteria growth indicator tube (MGIT) cultures for the presumptive identification of the Mycobacterium tuberculosis complex (MTBC) and assessed the reliability of this strategy for correctly directing isolates to drug susceptibility testing (DST) or species identification. A total of 1526 isolates of mycobacteria received at the Instituto Adolfo Lutz were prospectively subjected to presumptive identification by the observation of growth characteristics along with cord formation detection via microscopy...
April 23, 2018: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/29670585/maldi-spectra-database-for-rapid-discrimination-and-subtyping-of-mycobacterium-kansasii
#12
Jayaseelan Murugaiyan, Astrid Lewin, Elisabeth Kamal, Zofia Bakuła, Jakko van Ingen, Vit Ulmann, Miren J Unzaga Barañano, Joanna Humięcka, Aleksandra Safianowska, Uwe H Roesler, Tomasz Jagielski
Mycobacterium kansasii is an emerging non-tuberculous mycobacterial (NTM) pathogen capable of causing severe lung disease. Of the seven currently recognized M. kansasii genotypes (I-VII), genotypes I and II are most prevalent and have been associated with human disease, whereas the other five (III-VII) genotypes are predominantly of environmental origin and are believed to be non-pathogenic. Subtyping of M. kansasii serves as a valuable tool to guide clinicians in pursuing diagnosis and to initiate the proper timely treatment...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29643203/evaluation-of-the-vitek-ms-v3-0-matrix-assisted-laser-desorption-ionization-time-of-flight-mass-spectrometry-system-for-identification-of-mycobacterium-and-nocardia-species
#13
Barbara A Body, Melodie A Beard, E Susan Slechta, Kimberly E Hanson, Adam P Barker, N Esther Babady, Tracy McMillen, Yi-Wei Tang, Barbara A Brown-Elliott, Elena Iakhiaeva, Ravikiran Vasireddy, Sruthi Vasireddy, Terry Smith, Richard J Wallace, S Turner, L Curtis, Susan Butler-Wu, Jenna Rychert
This multi-center study was designed to assess the accuracy and reproducibility of the VITEK MS v3.0 matrix-assisted laser desorption ionization--time of flight (MALDI-TOF) mass spectrometry system for identification of Mycobacterium and Nocardia species compared to DNA sequencing. A total of 963 clinical isolates representing 51 taxa were evaluated. In all, 663 isolates were correctly identified to the species level (69%) with another 231 (24%) correctly identified to the complex or group level. Fifty-five isolates (6%) could not be identified despite repeat testing...
April 11, 2018: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/29605343/surgical-treatment-for-chronic-cervical-lymphadenitis-in-children-experience-from-a-tertiary-care-paediatric-centre-on-non-tuberculous-mycobacterial-infections
#14
Giuseppe Spinelli, Giuditta Mannelli, Francesco Arcuri, Elisabetta Venturini, Elena Chiappini, Luisa Galli
OBJECTIVES: Non-tuberculous mycobacteria are the most frequent cause of chronic lymphadenitis in children. We reviewed treatment and outcomes of paediatric patients with chronic cervical lymphadenitis, to better understand their differential diagnosis, surgical indication, complication and recover. METHODS: A retrospective study was carried out on children who underwent surgery from 2013 to 2016 at Meyer Children's University Hospital, Florence, Italy. Time to cure, type of surgery, and complications rate were determined and etiologic agents were identified and correlated to their clinical presentation...
May 2018: International Journal of Pediatric Otorhinolaryngology
https://www.readbyqxmd.com/read/29600220/mycobacteria-intracellulare-spondylodiscitis-presenting-as-progressive-consecutive-vertebral-sclerosis-a-case-report
#15
Kunal Shah, Gaurang Atodaria, Milind Patwardhan, Abhay Nene
Introduction: Non-tuberculous mycobacteria (NTM) are slow-growing organisms affecting both immunocompromised and immunocompetent patients. As compared to tuberculosis, they pose formidable challenge in successful management beginning with diagnosis extending through its treatment. Case Report: Our case highlights unusual spinal presentation of NTM, intricacies in diagnosis, and successful management. Conclusion: As the prevalence of NTM is rising, it is important as clinicians to understand unique aspects which differ from tuberculosis for appropriate and successful treatment...
November 2017: Journal of Orthopaedic Case Reports
https://www.readbyqxmd.com/read/29568531/-mycobacterium-kansasii-osteomyelitis-a-masquerading-disease
#16
Kiranmai Bhatt, Krishna Banavathi
Introduction: Non-tuberculous mycobacteria (NTM) are environmental bacteria capable of causing an opportunistic myriad of infections. Mycobacterium kansasii , one such NTM, is responsible for causing pulmonary disease in immunocompromised patients. Rare extrapulmonary manifestations such as lymphadenitis, osteoarticular manifestations, and skin and soft tissue infections are also observed. Case presentation: Here, we report an unusual case of sternoclavicular joint and elbow joint infection with M...
January 2018: JMM Case Reports
https://www.readbyqxmd.com/read/29563276/non-tuberculous-mycobacterial-infections-related-to-peritoneal-dialysis
#17
Hiroyuki Inoue, Naoki Washida, Kohkichi Morimoto, Keisuke Shinozuka, Takahiro Kasai, Kiyotaka Uchiyama, Hirobumi Tokuyama, Shu Wakino, Hiroshi Itoh
Most infections related to peritoneal dialysis (PD) are caused by common bacteria, and non-tuberculous mycobacteria are rare. The clinical characteristics and prognosis of PD patients with non-tuberculous mycobacterial infections were investigated at our hospital. Non-tuberculous mycobacteria were detected in 11 patients (exit-site infection, tunnel infection, and peritonitis in 3, 5, and 3 patients, respectively). Mycobacterium fortuitum , Mycobacterium chelonae , and Mycobacterium abscessus were identified in 4, 2, and 2 patients, respectively...
March 2018: Peritoneal Dialysis International: Journal of the International Society for Peritoneal Dialysis
https://www.readbyqxmd.com/read/29559518/paradigm-for-diagnosing-mycobacterial-disease-direct-detection-and-differentiation-of-mycobacterium-tuberculosis-complex-and-non-tuberculous-mycobacteria-in-clinical-specimens-using-multiplex-real-time-pcr
#18
Jeong-Uk Kim, Dae-Shick Ryu, Choong-Hwan Cha, Seon-Hee Park
AIMS: Mycobacterium tuberculosis and non-tuberculous mycobacteria (NTM) are clinically different, and the rapid detection and differentiation of M. tuberculosis complex (MTBC) and NTM is crucial for patient management and infection control. Given the slow growth of most pathogenic mycobacteria, nucleic acid amplification assays are excellent tools for direct identification of mycobacteria in clinical specimens. Recently, a multiplex real-time PCR assay was developed that can directly detect 20 mycobacterial species in clinical specimens...
March 20, 2018: Journal of Clinical Pathology
https://www.readbyqxmd.com/read/29559101/cross-reactive-immune-responses-in-cattle-arising-from-exposure-to-mycobacterium-bovis-and-non-tuberculous-mycobacteria
#19
A O Jenkins, E Gormley, N Gcebe, G T Fosgate, A Conan, C Aagaard, A L Michel, V P M G Rutten
Accurate diagnosis of tuberculosis in cattle may be compromised in areas where there are high rates of exposure to environmental/non-tuberculous mycobacteria (NTM). This cross reaction of immune responses to Mycobacterium bovis antigens shared with NTMs can result in reduced specificity of commonly used diagnostic tests including tuberculin skin tests and the interferon gamma assay (IFN-ɣ). In this study we assessed the cross-reactive immune responses of M. bovis (infected) and NTM exposed animals to M. bovis and M...
April 1, 2018: Preventive Veterinary Medicine
https://www.readbyqxmd.com/read/29558492/comparative-analysis-of-volatile-organic-compounds-for-the-classification-and-identification-of-mycobacterial-species
#20
Anne Küntzel, Peter Oertel, Sina Fischer, Andreas Bergmann, Phillip Trefz, Jochen Schubert, Wolfram Miekisch, Petra Reinhold, Heike Köhler
BACKGROUND: Species of Mycobacteriaceae cause serious zoonotic diseases in mammals, for example tuberculosis in humans, dogs, parrots, and elephants (caused by Mycobacterium tuberculosis) and in ruminants and humans (caused by M. bovis and M. caprae). Pulmonary diseases, lymphadenitis, skin diseases, and disseminated diseases can be caused by non-tuberculous mycobacteria (NTM). Diagnosis and differentiation among Mycobacterium species are currently done by culture isolation. The established diagnostic protocols comprise several steps that allow species identification...
2018: PloS One
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