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https://www.readbyqxmd.com/read/29044406/clinical-mycobacterium-abscessus-strain-inhibits-autophagy-flux-and-promotes-its-growth-in-murine-macrophages
#1
Seong-Woo Kim, Bindu Subhadra, Jake Whang, Yong Woo Back, Hyun Shik Bae, Hwa-Jung Kim, Chul Hee Choi
Autophagy is known to be a vital homeostatic defense process that controls mycobacterial infection. However, the relationship between autophagy response and the virulence of Mycobacterium abscessus strain UC22 has not been reported. Here, we demonstrate that M. abscessus induces autophagy and inhibits autophagy flux in murine macrophages. Further, the rough variant of M. abscessus, UC22 that is a highly virulent clinical isolate, significantly inhibited autophagic flux than the smooth variant of M. abscessus ATCC 19977...
November 30, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/29030295/the-new-phylogeny-of-the-genus-mycobacterium-the-old-and-the-news
#2
Enrico Tortoli, Tarcisio Fedrizzi, Conor J Meehan, Alberto Trovato, Antonella Grottola, Elisabetta Giacobazzi, Giulia Fregni Serpini, Sara Tagliazucchi, Anna Fabio, Clotilde Bettua, Roberto Bertorelli, Francesca Frascaro, Veronica De Sanctis, Monica Pecorari, Olivier Jousson, Nicola Segata, Daniela M Cirillo
BACKGROUND: Phylogenetic studies of bacteria have been based so far either on a single gene (usually the 16S rRNA) or on concatenated housekeeping genes. For what concerns the genus Mycobacterium these approaches support the separation of rapidly and slowly growing species and the clustering of most species in well-defined phylogenetic groups. The advent of high-throughput shotgun sequencing leads us to revise conventional taxonomy of mycobacteria on the light of genomic data. For this purpose we investigated 89 newly sequenced species in addition to 60 retrieved from GenBank and used the Average Nucleotide Identity pairwise scores to reconstruct phylogenetic relationships within this genus...
October 10, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28988958/mycobacterium-abscessus-and-massiliense-lung-infection-during-macrolide-treatment-for-bronchiolitis-obliterans-after-allogeneic-hematopoietic-stem-cell-transplantation
#3
Noriko Miyake, Yong Chong, Ruriko Nishida, Katsuto Takenaka, Koji Kato, Toshihiro Miyamoto, Akio Aono, Akiko Takaki, Satoshi Mitarai, Shinji Shimoda, Nobuyuki Shimono, Koichi Akashi
In patients undergoing allogeneic hematopoietic stem cell transplantation (allo-SCT), post-transplant lung infection is critical for their prognosis. Mycobacterium abscessus complex is not fully recognized as a nontuberculous mycobacteria (NTM) pathogen of post-SCT lung infection. Here, we present three post-allogeneic SCT patients who developed pulmonary infection caused by M. abscessus complex including M. abscessus and M. massiliense. In all three cases, macrolide antibiotics had been administered for bronchiolitis obliterans syndrome (BOS) before the confirmation of their infection, and macrolide resistance was noted in the M...
October 5, 2017: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
https://www.readbyqxmd.com/read/28983867/mycobacterium-abscessus-complex-infections-in-children-a-review
#4
REVIEW
Arick P Sabin, Patricia Ferrieri, Susan Kline
PURPOSE OF REVIEW: Infections in children with Mycobacterium abscessus complex represent a particular challenge for clinicians. Increasing incidence of these infections worldwide has necessitated focused attention to improve both diagnostic as well as treatment modalities. Published medical literature was reviewed, with emphasis on material published in the past 5 years. RECENT FINDINGS: Increasing availability of new diagnostic tools, such as matrix-assisted laser desorption ionization-time of flight mass spectrometry and custom PCRs, has provided unique insights into the subspecies within the complex and improved diagnostic certainty...
October 5, 2017: Current Infectious Disease Reports
https://www.readbyqxmd.com/read/28971307/non-tuberculous-mycobacterium-bacteraemia-in-a-pregnant-systemic-lupus-erythematosus-sle-patient-a-case-review-and-pooled-case-analysis
#5
REVIEW
Syahrul Sazliyana Shaharir, Narisa Sulaiman Sahari, Zeena Mohamed Fuad, Wan Zul Haikal Wan Zukiman, Nurul Hafizah Mohd Yusof, Anita Sulong, Petrick Periasamy
Non-tuberculous mycobacteria (NTM) are recognized as an important cause of human diseases and infections. It is commonly known to cause infections of the skin, soft tissue infections, and pulmonary infection as well as bacteraemia. We report a challenging case of severe mycobacterium abscessus bacteraemia in a pregnant lady with active systemic lupus erythematous (SLE). A comprehensive literature review of NTM infection among SLE patients was also performed, and pooled analysis of the reported cases, including our case, was done to determine the clinical characteristics and factors associated with poor outcome of NTM infection...
October 3, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/28961987/effect-of-%C3%AE-lactamase-production-and-%C3%AE-lactam-instability-on-mic-testing-results-for-mycobacterium-abscessus
#6
Anna Rominski, Bettina Schulthess, Daniel M Müller, Peter M Keller, Peter Sander
Objectives: Limited treatment options available for Mycobacterium abscessus infections include the parenteral β-lactam antibiotics cefoxitin and imipenem, which show moderate in vitro activity. Other β-lactam antibiotics (except meropenem) have no considerable in vitro activity, due to their rapid hydrolysis by a broad-spectrum β-lactamase (Bla_ Mab ). We here addressed the impact of β-lactamase production and β-lactam in vitro stability on M. abscessus MIC results and determined the epidemiological cut-off (ECOFF) values of cefoxitin, imipenem and meropenem...
September 8, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28959242/relationship-between-antibiotic-susceptibility-and-genotype-in-mycobacterium-abscessus-clinical-isolates
#7
Bing Li, Shiyi Yang, Haiqing Chu, Zhemin Zhang, Weijia Liu, Liulin Luo, Wei Ma, Xiaogang Xu
This study aimed to determine the antibiotic susceptibility and resistance related genotypes of Mycobacterium abscessus. One hundred sixty-two clinical isolates were collected. Genomic data were obtained by whole genome sequencing. Single nucleotide polymorphism (SNP) analysis was conducted using the NCBI GenBank database and BLAST algorithm. The following genes were of interest: erm(41), rrl and rrs. Erm(41) was further divided into 3 sequevars: erm(41)C28, erm(41)T28, and M type [erm(41) with deletions in nucleotides 64 and 65, or 159 through 432]...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28955087/mycobacterium-abscessus-lymphadenitis-in-bone-marrow-transplant-patient
#8
Muhammad Khalid, Syed Asad Ali
Non-tuberculous mycobacteria (NTM) are acid-fast bacteria categorized into rapidly growing and slow growing mycobacteria. NTM are more common in transplant patients who are immunocompromised. Here we report the case of a post- bone marrow transplant adolescent male presenting with submandibular swelling and fever. The gland was excised and the histopathology showed chronic granulomatous inflammation. Culture grew Mycobacterium abscessus which was sensitive to amikacin, linezolid and clarithromycin. A good response was achieved on therapy...
October 2017: JPMA. the Journal of the Pakistan Medical Association
https://www.readbyqxmd.com/read/28953638/anti-interferon-%C3%AE-autoantibody-associated-disseminated-mycobacterium-abscessus-infection-mimicking-parotid-cancer-with-multiple-metastases-a-case-report
#9
Po-Hsiung Chang, Yu-Chung Chuang
RATIONALE: Among the nontuberculous mycobacteria, Mycobacterium abscessus is a common cause of skin, soft tissue, and bone infections. However, disseminated M. abscessus infection that mimics cancer metastasis with an underlying relatively immunocompetent condition has rarely been reported. PATIENT CONCERNS: A nonsmoking 73-year-old man with an underlying relatively immunocompetent condition reported a 2-month history of a mass in the region of his right parotid gland that had been steadily increasing in size...
September 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28951015/effectiveness-of-an-ultraviolet-c-disinfection-system-for-reduction-of-healthcare-associated-pathogens
#10
Jui-Hsuan Yang, Un-In Wu, Huei-Min Tai, Wang-Huei Sheng
BACKGROUND: Healthcare-associated infections caused by multidrug-resistant (MDR) pathogens are significantly associated with increased mortality and morbidity. Environmental cleaning can reduce transmission of these pathogens but is often inadequate. Adjunctive methods are warranted to enhance the effectiveness of disinfection particularly in hospital settings where healthcare-associated infections are of major concern. METHODS: We conducted a study to examine the effectiveness of a mobile, automatic device, Hyper Light Disinfection Robot (model: Hyper Light P3), which utilized ultraviolet-C (UV-C) to kill MDR-Pseudomonas aeruginosa, MDR- Acinetobacter baumannii, methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant Enterococcus faecium (VRE), Mycobacterium abscessus and Aspergillus fumigatus...
September 18, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28948933/mycobacterium-abscessus-glossitis
#11
Jae-Hoon Ko, Cheol-In Kang, Sun Young Cho, Young Eun Ha, Nam Yong Lee, Seok Jin Kim, Doo Ryeon Chung, Kyong Ran Peck, Jae-Hoon Song
No abstract text is available yet for this article.
October 2017: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/28944144/osteomyelitis-due-to-multiple-rare-infections-in-a-patient-with-idiopathic-cd4-lymphocytopenia
#12
Nitin Gupta, Sayantan Banerjee, Timitrov, Rohini Sharma, Shambo Guha Roy, Trupti M Shende, Mohammed Tahir Ansari, Gagandeep Singh, Neeraj Nischal, Naveet Wig, Manish Soneja
A 26-year-old male patient presented with features suggestive of osteomyelitis involving the entire left femur, hip joint and knee joint. Culture from the debrided tissue grew Acinetobacter spp. and he was treated with sensitivity based antibiotics but the symptoms did not resolve. The synovial biopsy showed multinucleated giant cells and acid fast bacilli on Ziehl Neelsen stain. Cartridge based nucleic acid amplification test (GeneXpert) was negative. The Mycobacteria growth indicator tube culture was found to be positive for Mycobacterium abscessus...
August 2017: Intractable & Rare Diseases Research
https://www.readbyqxmd.com/read/28938329/mandibular-osteomyelitis-and-cervical-lymphadenitis-due-to-mycobacterium-abscessus-surgical-management-of-a-pediatric-cohort-with-a-shared-epidemiologic-exposure
#13
Peter W Thompson, Joseph K Williams
BACKGROUND: Mycobacterium abscessus has been implicated as the cause of various infections in the setting of healthcare-related "outbreaks." Mandibular osteomyelitis caused by M abscessus is exceedingly rare, with only 1 patient reported in the literature. The authors describe the surgical management of 12 pediatric patients with M abscessus-related mandibular osteomyelitis and cervical lymphadenitis caused by exposure to contaminated water at a regional dental clinic. METHODS: Following institutional review board approval, new suspected patients were reviewed and followed prospectively...
September 21, 2017: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/28934511/multi-drug-resistant-surgical-site-infection-due-to-mycobacterium-abscessus-complex
#14
Richa Misra, Vidhi Jain, Nidhi Tejan, Aarti Negi, Jyoti Umrao, Tapan Nirodhechand Dhole
M. abscessus complex is notoriously resistant to most antimicrobial agents. The complex is differentiated into 3 subspecies: M. abscessus subsp. abscessus, M. abscessus subsp. massiliense, and M. abscessus subsp. bolletii. Skin and soft tissue infections due to this organism can be acquired by direct contact with contaminated material through traumatic injury, surgical wound and environmental exposure or by secondary involvement of skin/soft tissue during disseminated disease. We report a case of Mycobacterium abscessus infection recovered from a post-operative mid-line abdominal wound to illustrate the diagnostic and management difficulties encountered in such patients...
August 1, 2017: Laboratory Medicine
https://www.readbyqxmd.com/read/28933689/galk-based-suicide-vector-mediated-allelic-exchange-in-mycobacterium-abscessus
#15
Stacy A Gregoire, Joel Byam, Martin S Pavelka
Mycobacterium abscessus is a fast-growing environmental organism and an important emerging pathogen. It is highly resistant to many antibiotics and undergoes a smooth to rough colony morphology change that appears to be important for pathogenesis. Smooth environmental strains have a glycopeptidolipid (GPL) on the surface, while certain types of clinical strains are often rough and lack this GPL, due to mutations in biosynthetic genes or the mmpL4b transporter gene. We report here the development and evaluation of an allelic exchange system for unmarked alleles in M...
September 21, 2017: Microbiology
https://www.readbyqxmd.com/read/28932317/ventral-abdominal-hernia
#16
Georgi Tchernev, Anastasiya Chokoeva, Jacopo Lotti, Katlein França, Torello Lotti
A 63-year-old Caucasian female patient presented with redness of the both foot and lower legs, as well as edema of the left lower leg, accompanied by subjective complaints of burning. Fever was not reported. Well-circumscribed oval shaped tumor formation was revealed also on the abdominal wall, with hyperpigmented and depigmented areas on its ulcerated surface, measuring approximately 10/10cm in diameter, with soft-elastic texture on palpation. The lesion occurred in 2011, according to the patient's history...
August 15, 2017: Open Access Macedonian Journal of Medical Sciences
https://www.readbyqxmd.com/read/28930150/detection-of-bacterial-pathogens-from-broncho-alveolar-lavage-by-next-generation-sequencing
#17
Stefano Leo, Nadia Gaïa, Etienne Ruppé, Stephane Emonet, Myriam Girard, Vladimir Lazarevic, Jacques Schrenzel
The applications of whole-metagenome shotgun sequencing (WMGS) in routine clinical analysis are still limited. A combination of a DNA extraction procedure, sequencing, and bioinformatics tools is essential for the removal of human DNA and for improving bacterial species identification in a timely manner. We tackled these issues with a broncho-alveolar lavage (BAL) sample from an immunocompromised patient who had developed severe chronic pneumonia. We extracted DNA from the BAL sample with protocols based either on sequential lysis of human and bacterial cells or on the mechanical disruption of all cells...
September 20, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28923867/vancomycin-and-clarithromycin-show-synergy-against-mycobacterium-abscessus-in-vitro
#18
Devika Mukherjee, Mu-Lu Wu, Jeanette W P Teo, Thomas Dick
Lung disease caused by Mycobacterium abscessus is increasing and current clarithromycin-based treatment regimens are only moderately effective. Here, we determined the effect of clarithromycin-vancomycin combination against M. abscessus complex isolates in vitro. Synergy was found with an FICI ≤ 0.5 and a 4 to 10-fold decrease of minimum inhibitory concentrations.
September 18, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28923675/respiratory-infections-due-to-nontuberculous-mycobacterias
#19
REVIEW
Luis Máiz Carro, Esther Barbero Herranz, Rosa Nieto Royo
The most common infections caused by nontuberculous mycobacteria (NTM) are lung infections. The microorganisms causing these infections most frequently are Mycobacterium avium complex, Mycobacterium kansasii and Mycobacterium abscessus complex. Their incidence has increased in the last three decades. After identifying an NTM in the respiratory tract, clinical and radiological aspects must be considered to determine if isolations are clinically relevant. Predisposing conditions that could contribute to infection must also be investigated...
September 15, 2017: Medicina Clínica
https://www.readbyqxmd.com/read/28920054/controlling-extra-and-intramacrophagic-mycobacterium-abscessus-by-targeting-mycolic-acid-transport
#20
Albertus Viljoen, Jean-Louis Herrmann, Oluseye K Onajole, Jozef Stec, Alan P Kozikowski, Laurent Kremer
Mycobacterium abscessus is a rapidly growing mycobacterium (RGM) causing serious infections especially among cystic fibrosis patients. Extremely limited therapeutic options against M. abscessus and a rise in infections with this mycobacterium require novel chemotherapies and a better understanding of how the bacterium causes infection. Different from most RGM, M. abscessus can survive inside macrophages and persist for long durations in infected tissues. We recently delineated differences in the infective programs followed by smooth (S) and rough (R) variants of M...
2017: Frontiers in Cellular and Infection Microbiology
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