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https://www.readbyqxmd.com/read/28820087/reinstating-mycobacterium-massiliense-and-mycobacterium-bolletii-as-species-of-the-mycobacterium-abscessus-complex
#1
Toidi Adekambi, Mohamed Sassi, Jakko van Ingen, Michel Drancourt
TheMycobacterium abscessus complex is a group of rapidly growing, multiresistant mycobacteria previously divided into three species. Proposal for the union of Mycobacterium bolletii and Mycobacterium massiliense into one subspecies, so-called M. abscessus subsp. massiliense, created much confusion about the routine identification and reporting of M. abscessus clinical isolates for clinicians. Results derived from multigene sequencing unambiguously supported the reinstatement of M. massiliense and M. bolletii as species, culminating in the presence of erm(41)-encoded macrolide resistance in M...
August 18, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28817307/geographic-distribution-of-nontuberculous-mycobacterial-species-identified-among-clinical-isolates-in-the-united-states-2009-2013
#2
Alicen B Spaulding, Yi Ling Lai, Adrian M Zelazny, Kenneth N Olivier, Sameer S Kadri, D Rebecca Prevots, Jennifer Adjemian
RATIONALE: Nontuberculous mycobacteria are an important cause of morbidity in the United States, although patient outcomes vary greatly by species. Currently, nationally representative data on the distribution of mycobacterial species from clinical isolates are limited. OBJECTIVES: Using a national hospitalization database capturing microbiologic data for nearly six million patient encounters, we describe the geographic distribution of, and patient demographic features associated with, clinical mycobacterial isolates in the United States...
August 17, 2017: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/28809146/mycobacterium-talmoniae-sp-nov-a-slowly-growing-mycobacterium-isolated-from-human-respiratory-samples
#3
Rebecca M Davidson, Mary Ann DeGroote, Jamie L Marola, Sarah Buss, Victoria Jones, Michael R McNeil, Alison G Freifeld, L Elaine Epperson, Nabeeh A Hasan, Mary Jackson, Peter C Iwen, Max Salfinger, Michael Strong
A novel slowly growing, non-chromogenic species of the class Actinobacteria was isolated from a human respiratory sample in Nebraska, USA, in 2012. Analysis of the internal transcribed spacer sequence supported placement into the genus Mycobacterium with high sequence similarity to a previously undescribed strain isolated from a patient respiratory sample from Oregon, USA, held in a collection in Colorado, USA, in 2000. The two isolates were subjected to phenotypic testing and whole genome sequencing and found to be indistinguishable...
August 15, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28807917/bedaquiline-inhibits-the-atp-synthase-in-mycobacterium-abscessus-and-is-effective-in-infected-zebrafish
#4
Christian Dupont, Albertus Viljoen, Sangeeta Thomas, Françoise Roquet-Banères, Jean-Louis Herrmann, Kevin Pethe, Laurent Kremer
Pulmonary infections caused by Mycobacterium abscessus are emerging as a global threat, especially in cystic fibrosis patients. Further intensifying the concern of M. abscessus infection is the recent evidence of human-to-human transmission of the infection. M. abscessus is a naturally multidrug resistant, fast-growing pathogen for which pharmacological options are limited. Repurposing antitubercular drugs represents an attractive option for the development of chemotherapeutic alternatives against M. abscessus infections...
August 14, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28807911/systematic-review-and-meta-analyses-of-the-effect-of-chemotherapy-on-pulmonary-mycobacterium-abscessus-outcomes-and-disease-recurrence
#5
Jotam G Pasipanodya, Deborah Ogbonna, Beatriz E Ferro, Gesham Magombedze, Shashikant Srivastava, Devyani Deshpande, Tawanda Gumbo
Background. In pharmacokinetic/pharmacodynamics models of pulmonary Mycobacterium abscessus complex, the recommended macrolide-containing combination therapy has poor kill rates. However, clinical outcomes are unknown.Methods We searched the literature for studies published between 1990-2017 that reported microbial outcomes in patients treated for pulmonary M. abscessus disease. Good outcome was defined as sustained sputum culture conversion (SSCC) without relapse. Random effects models were used to pool studies and estimate proportions of patients with good outcomes...
August 14, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28795380/peritoneal-dialysis-associated-catheter-infection-caused-by-mycobacterium-abscessus-in-an-elderly-patient-who-was-successfully-treated-with-catheter-removal
#6
Arata Hibi, Takahisa Kasugai, Keisuke Kamiya, Keisuke Kamiya, Chiharu Ito, Satoru Kominato, Ken Mizuguchi, Toshiyuki Miura, Katsushi Koyama
An 89-year-old Japanese man on peritoneal dialysis (PD) was suspected of having a PD-associated catheter infection. He visited the hospital because of the discharge of pus from the exit site of his catheter. Gram staining of the pus showed Gram-positive bacilli, but these were acid-fast bacilli. The rapidly growing nontuberculous mycobacteria, Mycobacterium abscessus, was isolated. PD catheter removal and debridement were immediately performed. The patient received combination antibiotic therapy. His clinical course was good, but he required hemodialysis due to the discontinuation of PD...
August 9, 2017: CEN Case Reports
https://www.readbyqxmd.com/read/28793869/the-efficacy-safety-and-feasibility-of-inhaled-amikacin-for-the-treatment-of-difficult-to-treat-non-tuberculous-mycobacterial-lung-diseases
#7
Kazuma Yagi, Makoto Ishii, Ho Namkoong, Takahiro Asami, Osamu Iketani, Takanori Asakura, Shoji Suzuki, Hiroaki Sugiura, Yoshitake Yamada, Tomoyasu Nishimura, Hiroshi Fujiwara, Yohei Funatsu, Yoshifumi Uwamino, Tetsuro Kamo, Sadatomo Tasaka, Tomoko Betsuyaku, Naoki Hasegawa
BACKGROUND: In multidrug regimens, including an intravenous aminoglycoside (e.g. amikacin [AMK]) is recommended for difficult-to-treat non-tuberculous mycobacterial (NTM) lung diseases. We aimed to evaluate the efficacy, safety, and feasibility of inhaled AMK therapy in patients with difficult-to-treat NTM lung diseases in a retrospective chart review. METHODS: The study population consisted of patients with NTM lung diseases who received combination therapy, including inhaled AMK therapy, at Keio University Hospital (Tokyo, Japan), from January 2014 through May 2016...
August 9, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28790995/trehalose-polyphleates-external-cell-wall-lipids-in-mycobacterium-abscessus-are-associated-with-the-formation-of-clumps-with-cording-morphology-which-have-been-associated-with-virulence
#8
Marta Llorens-Fons, Míriam Pérez-Trujillo, Esther Julián, Cecilia Brambilla, Fernando Alcaide, Thomas F Byrd, Marina Luquin
Mycobacterium abscessus is a reemerging pathogen that causes pulmonary diseases similar to tuberculosis, which is caused by Mycobacterium tuberculosis. When grown in agar medium, M. abscessus strains generate rough (R) or smooth colonies (S). R morphotypes are more virulent than S morphotypes. In searching for the virulence factors responsible for this difference, R morphotypes have been found to form large aggregates (clumps) that, after being phagocytozed, result in macrophage death. Furthermore, the aggregates released to the extracellular space by damaged macrophages grow, forming unphagocytosable structures that resemble cords...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28776521/epidemiological-and-laboratorial-profile-of-patients-with-isolation-of-nontuberculous-mycobacteria
#9
Heloisa Silveira Paro Pedro, Andréa Gobetti Vieira Coelho, Isabela Mazuco Mansur, Ana Carolina Chiou, Maria Izabel Ferreira Pereira, Naiara Cristina Ule Belotti, Manuela Galloy Sanches Ismael, Maria Rita de Cássia Oliveira Cury, Susilene Maria Tonelli Nardi, Érica Chimara
BACKGROUND: An increase in NTM diseases in the international scenario has been observed in recent years. AIMS: To analyze the epidemiological and laboratory profiles of patients with isolation of nontuberculous mycobacteria (NTM) over one decade. A retrospective analysis of records of a mycobacterial reference laboratory found 135 cases with isolation of NTM. METHODS: Clinical and epidemiological data were collected from the records of government health clinics and from the State notification system (TBWEB)...
July 2017: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28760902/mycobacterium-abscessus-l-d-transpeptidases-are-susceptible-to-inactivation-by-carbapenems-and-cephalosporins-but-not-penicillins
#10
Pankaj Kumar, Varsha Chauhan, José Rogério A Silva, Jerônimo Lameira, Felipe d'Andrea, Shaogang Li, Stephan L Ginell, Joel S Freundlich, Cláudio Nahum Alves, Scott Bailey, Keira A Cohen, Gyanu Lamichhane
As a growing number of clinical isolates of Mycobacterium abscessus are resistant to most antibiotics, new treatment options that are effective against these drug-resistant strains are desperately needed. The majority of the linkages in the cell wall peptidoglycan of M. abscessus are synthesized by non-classical transpeptidases, namely the L,D-transpeptidases. Emerging evidence suggests that these enzymes represent a new molecular vulnerability in this pathogen. Recent studies have demonstrated that inhibition of these enzymes by the carbapenem class of β-lactams determines their activity against M...
July 31, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28754702/mycobacterium-abscessus-displays-fitness-for-fomite-transmission
#11
Kenneth C Malcolm, Silvia M Caceres, Jennifer R Honda, Rebecca M Davidson, L Elaine Epperson, Michael Strong, Edward D Chan, Jerry A Nick
Mycobacterium abscessus (Mab) is a rapidly growing nontuberculous mycobacterium (NTM) increasingly reported in soft tissue infections and chronic lung diseases, including cystic fibrosis. The environmental source of Mab has not been definitively identified, but NTM have been detected in soil and water. To determine the potential of soil-derived Mab as an infectious source we explored the association, growth, and survival of Mab with defined mineral particulates, including kaolin, halloysite, and silicone dioxide, and house dust as possible Mab fomites...
July 28, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28752292/effect-of-amikacin-on-cell-wall-glycopeptidolipid-synthesis-in-mycobacterium-abscessus
#12
So-Young Lee, Hee-Youn Kim, Byoung-Jun Kim, Hong Kim, Seung-Hyeok Seok, Bum-Joon Kim, Yoon-Hoh Kook
Cultivation of the smooth colony Mycobacterium abscessus at the sub-minimum inhibitory concentration (MIC) of amikacin changed its growth pattern including its colony morphology (smooth to rough) and cell arrangement (dispersed to cord formation). In addition, reduced sliding motility and biofilm formation were observed. The amount of glycogpetidolipid (GPL) and mRNA expression of key genes involved in GPL synthesis were decreased in the amikacin-treated M. abscessus strain. An in vitro infection assay revealed that the amikacin-treated smooth M...
August 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28740697/successful-treatment-of-acute-respiratory-failure-in-a-patient-with-pulmonary-mycobacterium-abscessus-infection-accompanied-by-organizing-pneumonia
#13
Goohyeon Hong, Doh Hyung Kim, Youn Seup Kim
Organizing pneumonia (OP) is an inflammatory lung disease characterized pathologically by the presence of buds of granulation tissue in the distal air spaces. There are numerous causes of OP including acute respiratory infections such as viral and bacterial infections. However, Mycobacterium abscessus (M. abscessus) has rarely been reported as a causative pathogen of OP. Here, we report a 67-year-old woman with rapidly progressive pulmonary M. abscessus infection who developed OP and acute respiratory failure (ARF)...
June 2017: Journal of Thoracic Disease
https://www.readbyqxmd.com/read/28739795/clinical-characteristics-and-treatment-outcomes-of-patients-with-acquired-macrolide-resistant-mycobacterium-abscessus-lung-disease
#14
Hayoung Choi, Su-Young Kim, Dae Hun Kim, Hee Jae Huh, Chang-Seok Ki, Nam Yong Lee, Seung-Heon Lee, Soyoun Shin, Sung Jae Shin, Charles L Daley, Won-Jung Koh
Macrolide antibiotics are mainstays in the treatment of lung disease due to the Mycobacterium abscessus complex. Although previous studies have reported development of acquired macrolide resistance in this species, limited data are available on the outcomes of lung disease due to macrolide-resistant M. abscessus subspecies abscessus (hereafter M. abscessus). This study evaluated the clinical features, treatment outcomes, and molecular characteristics of macrolide-resistant isolates of M. abscessus We performed a retrospective review of medical records and genetic analysis of clinical isolates from 13 patients who had acquired macrolide-resistant M...
July 24, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28711221/the-evolution-of-lung-transplantation-for-cystic-fibrosis-a-2017-update
#15
REVIEW
Gregory Snell, Anna Reed, Marc Stern, Denis Hadjiliadis
Lung transplantation (LTx) is an established therapy for patients with end-stage cystic fibrosis (CF). Indeed, CF is the commonest indication for those aged<50years of age needing LTx. CF LTx is associated with a 45% 10year survival - according to the world's largest registry. It is important all otherwise suitable CF patients with severe lung disease have a timely referral for discussion and consideration of the possibility of LTx. LTx discussions must carefully consider colonisation or infection with Burkholderia cenocepacia, Mycobacterium abscessus and Scediosporium - as good LTx outcomes cannot be guaranteed...
July 12, 2017: Journal of Cystic Fibrosis: Official Journal of the European Cystic Fibrosis Society
https://www.readbyqxmd.com/read/28709485/biofilm-colonization-of-mycobacterium-abscessus-new-threat-in-hospital-acquired-surgical-site-infection
#16
Roumi Ghosh, Soumen Das, Harish Kela, Asmita De, Jayeeta Haldar, Prasanta Kumar Maiti
INTRODUCTION: Rapidly growing non-tuberculous mycobacteria (NTM) are hazardous cause of post-operative soft tissue infection leading to nosocomial outbreaks following various surgical procedures, especially laparoscopic surgeries using heat sensitive, non-autoclavable surgical instruments. METHODOLOGY: Surgery department of our hospital noticed increase in rate of post-laparoscopic abdominal port site infection (PSI) and informed the Microbiology Department. A prospective investigational study of defined cases with the aim of source tracing and formulation of infection control measures was initiated...
July 2017: Indian Journal of Tuberculosis
https://www.readbyqxmd.com/read/28708374/chemical-modification-and-detoxification-of-the-pseudomonas-aeruginosa-toxin-2-heptyl-4-hydroxyquinoline-n-oxide-by-environmental-and-pathogenic-bacteria
#17
Sven Thierbach, Franziska S Birmes, Matthias C Letzel, Ulrich Hennecke, Susanne Fetzner
2-Heptyl-4-hydroxyquinoline N-oxide (HQNO), a major secondary metabolite and virulence factor produced by the opportunistic pathogen Pseudomonas aeruginosa, acts as a potent inhibitor of respiratory electron transfer and thereby affects host cells as well as microorganisms. In this study, we demonstrate the previously unknown capability of environmental and pathogenic bacteria to transform and detoxify this compound. Strains of Arthrobacter and Rhodococcus spp. as well as Staphylococcus aureus introduced a hydroxyl group at C-3 of HQNO, whereas Mycobacterium abscessus, M...
July 27, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28707184/misdiagnosis-of-tuberculosis-associated-with-some-species-of-nontuberculous-mycobacteria-by-genexpert-mtb-rif-assay
#18
Yu Pang, Jie Lu, Biyi Su, Huiwen Zheng, Yanlin Zhao
Out of 12 nontuberculous mycobacteria (NTM) species, 5 were identified as Mycobacterium tuberculosis (MTB) by GeneXpert at a bacterial load of 10(6). Notably, two species, including M. abscessus and M. smegmatis, were flagged as RIF-resistant MTB due to the high C(t) value of Probe E. In conclusion, our data have demonstrated that the misdiagnosis of MTB by GeneXpert assay is observed in five NTM species at a high bacterial load.
July 13, 2017: Infection
https://www.readbyqxmd.com/read/28699669/detection-of-mycobacterium-marinum-m-%C3%A2-peregrinum-m-%C3%A2-fortuitum-and-m-%C3%A2-abscessus-in-aquarium-fish
#19
K Puk, T Banach, A Wawrzyniak, Ł Adaszek, J Ziętek, S Winiarczyk, L Guz
No abstract text is available yet for this article.
July 12, 2017: Journal of Fish Diseases
https://www.readbyqxmd.com/read/28674049/activities-of-lcb01-0371-a-novel-oxazolidinone-against-mycobacterium-abscessus
#20
Tae Sung Kim, Jin Ho Choe, Young Jae Kim, Chul-Su Yang, Hyun-Jin Kwon, Jinsun Jeong, Guehye Kim, Da Eun Park, Eun-Kyeong Jo, Young-Lag Cho, Jichan Jang
Mycobacterium abscessus is a highly pathogenic, drug-resistant, rapidly growing mycobacterium. In this study, we evaluated the in vitro, intracellular, and in vivo activities of LCB01-0371, a novel and safe oxazolidinone derivative, for the treatment of M. abscessus infection and compared its resistance to that of other oxazolidinone drugs. LCB01-0371 was effective against several M. abscessus strains in vitro and in a macrophage model of infection. In the murine model, a similar efficacy to linezolid was achieved, especially in the lungs...
July 3, 2017: Antimicrobial Agents and Chemotherapy
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