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Asuman Şamlı, Arzu İlki
Mycobacteria are an important cause of morbidity in humans. Rapid and accurate mycobacterial identification is important for improving patient outcomes. However, identification of Mycobacterium species is not easy, due to the slow and fastidious growth of mycobacteria. Recently, biochemical, sequencing, and probing methods have come to be used for identification. This study compared the performance of matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF MS) for the identification of M...
August 23, 2016: New Microbiologica
Chung-Jong Kim, Uh-Jin Kim, Hong Bin Kim, Sang Won Park, Myoung-Don Oh, Kyung-Hwa Park, Nam Joong Kim
Background Several case series have reported on clinical and radiographic characteristics of patients with vertebral osteomyelitis (VO) caused by non-tuberculous mycobacteria (NTM). However, only a few patients were included, and systematic reviews are still lacking. The aim of this study was to update and summarise the pre-disposing conditions, clinical and radiographic characteristics of such cases due to NTM. Methods In this study, a systematic review was conducted of the English-language literature from 1961-2014 to investigate the pre-disposing conditions and characteristics of cases of VO due to NTM...
July 2016: Infectious Diseases
Jason E Stout, Won-Jung Koh, Wing Wai Yew
Non-tuberculous mycobacteria (NTM) are emerging worldwide as significant causes of chronic pulmonary infection, posing a number of challenges for both clinicians and researchers. While a number of studies worldwide have described an increasing prevalence of NTM pulmonary disease over time, population-based data are relatively sparse and subject to ascertainment bias. Furthermore, the disease is geographically heterogeneous. While some species are commonly implicated worldwide (Mycobacterium avium complex, Mycobacterium abscessus), others (e...
April 2016: International Journal of Infectious Diseases: IJID
Xia Yu, Liping Zhao, Guanglu Jiang, Yifeng Ma, Weimin Li, Hairong Huang
BACKGROUND: The viable mycobacterial bacilli can sometimes form granules in the Mycobacterium Growth Indicator Tube (MGIT) to produce instrument-negative outcomes when BACTEC MGIT 960 culture is performed. The cause of this phenomenon has never been analyzed. METHODS: Thirty-one instrument-negative, granule presenting MGIT vials were collected for conducting acid-fast staining and also liquid and solid subculture. Species identification and drug susceptibility test were performed with the recovered strains...
2015: BioMed Research International
Jeong-Uk Kim, Choong-Hwan Cha, Seon-Hee Park
Culture in enriched broth, as well as on a solid medium, is recommended for primary isolation of mycobacteria. With the introduction of liquid mycobacterial culture methods, a substantial workload regarding the identification of culture-recovered mycobacterial species, particularly Mycobacterium tuberculosis complex (MTC), has been imposed on our laboratory. We thus developed a triplex, real-time PCR coupled with pyrosequencing assay that can directly identify mycobacterial species from liquid media, which can reduce the workload...
December 2015: Journal of Microbiological Methods
Martin Kuntz, Maximilian Seidl, Philipp Henneke
We present the case of a 6-year-old, immunocompetent boy with chronic osteomyelitis of the calcaneus caused by Mycobacterium xenopi. Of note, typical histopathology was not visible on the first biopsy and developed only later over a period of 6 weeks, highlighting the difficult differential diagnosis of osteomyelitis caused by nontuberculous mycobacteria.
January 2016: Pediatric Infectious Disease Journal
Keith W Y Kwong, Alan K L Ng, W K R Wong
We have recently employed an intein, Saccharomyces cerevisiae vascular membrane ATPase (VMA), in conjunction with efficient expression and secretory functions formed between the ompA leader sequence and the human epidermal growth factor (EGF) gene (fused at the 5' end of VMA), and the human basic fibroblast growth factor (bFGF) gene (fused at the 3' end of VMA), to engineer an efficient intein-based Escherichia coli system for high-level co-expression of EGF and bFGF as authentic mature products. Both products were found not only excreted to the culture medium but also located, surprisingly, in the cytoplasm (Kwong and Wong 2013)...
January 2016: Applied Microbiology and Biotechnology
Beatriz E Ferro, Jakko van Ingen, Melanie Wattenberg, Dick van Soolingen, Johan W Mouton
OBJECTIVES: This study aimed to provide basic pharmacodynamic information for key antibiotics used to treat Mycobacterium avium and Mycobacterium xenopi pulmonary disease. METHODS: M. avium subspecies hominissuis IWGMT49 and M. xenopi ATCC 19250 type strains were used; the MICs of clarithromycin, amikacin and moxifloxacin were determined by broth microdilution. Time-kill assays were performed, exposing bacteria to 2-fold concentrations from 0.062× to 32× the MIC at 37°C for 240 h for M...
October 2015: Journal of Antimicrobial Chemotherapy
D Rebecca Prevots, Theodore K Marras
Population-based data have documented a worldwide increase in the prevalence of human nontuberculous mycobacterial (NTM) infections since 2000. Mycobacterium avium complex is predominant in North America and East Asia, whereas in regions within Europe, M kansasii, M xenopi, and M malmoense are more common. Host factors important to the current epidemiology of NTM pulmonary disease include thoracic skeletal abnormalities, rheumatoid arthritis, and use of immunomodulatory drugs. Clustering of disease within families suggests a heritable genetic predisposition to disease susceptibility...
March 2015: Clinics in Chest Medicine
Roman S Esipov, Maria A Kostromina
Production of small recombinant peptides by expressing them as fusion proteins, with subsequent proteolytic or chemical cleavage of the latter, is a widespread approach in modern biotechnology. An alternative method is to produce such peptides as self-cleaving fusion proteins with inteins. To date, only a small proportion of known inteins have been used for this purpose, and analysis of other inteins for the ability to cleave off the target polypeptide can significantly expand the range of intein-based transgenic constructs available to researchers...
March 2015: Applied Biochemistry and Biotechnology
E P A T Gommans, P Even, C F M Linssen, H van Dessel, E van Haren, G J de Vries, A M C Dingemans, D Kotz, G G U Rohde
BACKGROUND: Infections with non-tuberculous mycobacteria (NTM) represent an increasing problem. Their clinical relevance is still largely unknown as well as predictors for mortality in affected patients. The objective was to describe prevalence and clinical relevance of different NTM and to identify risk factors for mortality. METHODS: Retrospective cohort study of 124 patients with NTM detection between January 2001 and December 2011. Clinical characteristics like symptoms and radiological appearance were assessed at presentation...
January 2015: Respiratory Medicine
Mashooq A Bhat
A new series of 4-thiazolidinone (3a-e) and 1,3,4-oxadiazole (4a-e) derivatives of isoniazid were synthesized and evaluated for their in vitro anti-mycobacterial activity. The structures of the compounds were confirmed on the basis of spectral data and elemental analysis. Some compounds showed interesting activity against four Mycobacterium strains: M. intercellulari (ATCC 35743), M. xenopi (ATCC 14470), M. cheleneo (ATCC 35751) and M. smegmatis (ATCC 35797). Compounds 3e, N-(4-oxo-2-undecylthiazolidin-3-yl) isonicotinamide and 4e N-acetyl-4-(5-undecyl-1,3,4-oxadiazol-2-yl) pyridine with minimum inhibitory concentration (MIC), 6...
September 2014: Acta Poloniae Pharmaceutica
Viral K Doshi, Shreedhar R Kulkarni, Nang M Kham, Kent S Kapitan
Coexistence of Mycobacterium xenopi with lung cancer has been reported. However, lung cancer originating within a pre-existing cavity caused by M. xenopi has not. A 55-y-old woman with a history of smoking presented with complaints of chronic dry cough, night sweats, and weight loss for several months. Computed tomography (CT) scanning revealed a 3.5-cm irregular thick-walled cavity in the right lung apex. Cultures obtained from a CT-guided biopsy grew M. xenopi. The patient received standard treatment, and her clinical symptoms improved, and the radiographic lesion stabilized...
March 2015: Respiratory Care
David C Alexander, Theodore K Marras, Jennifer H Ma, Samia Mirza, Daniel Liu, Julianne V Kus, Hafid Soualhine, Vincent Escuyer, David Warshauer, Sarah K Brode, David J Farrell, Frances B Jamieson
Mycobacterium xenopi is an opportunistic mycobacterial pathogen of increasing clinical importance. Surveillance of M. xenopi is hampered by the absence of tools for genotyping and molecular epidemiology. In this study, we describe the development and evaluation of an effective multilocus sequence typing strategy for M. xenopi.
November 2014: Journal of Clinical Microbiology
Srinivasan Vijay, Nagaraja Mukkayyan, Parthasarathi Ajitkumar
In this study, we show that about 20% of the septating Mycobacterium smegmatis and Mycobacterium xenopi cells in the exponential phase populationdivideasymmetrically, with an unusually high deviation (17 ± 4%) in the division site from the median, to generate short cells and long cells, thereby generating population heterogeneity. This mode of division is very different from the symmetric division of themajority (about 80%) of the septating cells in the Mycobacterium smegmatis, Mycobacterium marinum, and Mycobacterium bovis BCG exponential phase population, with 5-10% deviation in the division site from the mid-cell site, as reported by recent studies...
2014: Open Microbiology Journal
Abdulrahman Hakami
SESSION TITLE: Infectious Disease Case Reports Posters IIISESSION TYPE: Case Report PosterPRESENTED ON: Sunday, March 23, 2014 at 01:15 PM - 02:15 PMINTRODUCTION: Mycobacterium celatum was first described in 1993 and since then , sporadic reports have been published on the isolation of this mycobacterium from immunocomprised pateints. M. celatum is phenotypically similar to M. avium and M. xenopi. M. celatum is a recently described organism. Several reports exist in the literature establishing this organism as a convincing pathogen among Human Immunodeficiency Virus (HIV) seropositive patients...
March 1, 2014: Chest
Marieke J van der Werf, Csaba Ködmön, Vera Katalinić-Janković, Tiina Kummik, Hanna Soini, Elvira Richter, Dimitrios Papaventsis, Enrico Tortoli, Monique Perrin, Dick van Soolingen, Manca Zolnir-Dovč, Vibeke Ostergaard Thomsen
BACKGROUND: Since non-tuberculous mycobacteria (NTM) disease is not notifiable in most European Union (EU) and European Economic Area (EEA) countries, the epidemiological situation of the >150 NTM species is largely unknown. We aimed to collect data on the frequency of NTM detection and NTM species types in EU/EEA countries. METHODS: Officially nominated national tuberculosis reference laboratories of all EU/EEA countries were asked to provide information on: laboratory routines for detection and identification of NTM, including drug sensitivity testing (DST) methods; data on the number and type of NTM species identified; coverage and completeness of the provided data on NTM; type and number of human specimens tested for NTM; and number of specimens tested for Mycobacterium tuberculosis complex and NTM...
2014: BMC Infectious Diseases
Elisabeth Streit, Julie Millet, Nalin Rastogi
Nontuberculous mycobacteria (NTM) are ubiquitous environmental organisms able to cause severe opportunistic human infections. Their distribution patterns are subject to geographical variations. This study describes their isolation frequencies from clinical specimen in the three French overseas departments of the Americas, namely, Guadeloupe, Martinique, and French Guiana during 1994-2012. A total of 651 strains from as many patients (one isolate per species per patient) were analysed regarding regional isolation patterns and potential pattern changes over time...
2013: Tuberculosis Research and Treatment
Maria C Carrillo, Demetris Patsios, Ute Wagnetz, Frances Jamieson, Theodore K Marras
AIM: Mycobacterium xenopi is described with upper lobe cavitation ("fibrocavitary" pattern), whereas the Mycobacterium avium complex (MAC) is described with bronchiectasis and centrilobular nodules ("nodular bronchiectasis"). We retrospectively described and compared computed tomography (CT) chest manifestations of disease caused by MAC and M xenopi. MATERIALS AND METHODS: We reviewed patients who had either MAC or M xenopi lung disease and who had CTs between January 2002 and December 2003...
August 2014: Canadian Association of Radiologists Journal, Journal L'Association Canadienne des Radiologistes
Murat Gunaydin, Keramettin Yanik, Cafer Eroglu, Ahmet Sanic, Ismail Ceyhan, Zayre Erturan, Riza Durmaz
AIM: Mycobacteria other than tuberculosis (MOTT) cause increasingly serious infections especially in immunosuppressive patients by direct transmission from the environment or after colonization. However, identification of these species is difficult because of the cost and difficulties in defining to species level. Identification and distribution of these species can help clinician in the choice of treatment. MATERIALS AND METHODS: A total of 90 MOTT strains obtained from four different centers were included in the study...
2013: Annals of Clinical Microbiology and Antimicrobials
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