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non tuberculous mycobacteria

Richa Virmani, Yasha Hasija, Yogendra Singh
Mycobacteria show peculiar aggregated outgrowth like biofilm on the surface of solid or liquid media. Biofilms harbor antibiotic resistant bacteria in a self-produced extracellular matrix that signifies the bacterial fate to sedentary existence. Despite years of research, very little is known about the mechanisms that contribute to biofilm formation. LuxS has been previously known to play a role in biofilm formation in Autoinducer-2 dependent manner. We here show the effect of LuxS product-homocysteine, on the biofilm forming ability of non-tuberculous mycobacteria, Mycobacterium smegmatis and Mycobacterium bovis BCG showing AI-2 independent phenotypic effect of LuxS...
September 2018: Indian Journal of Microbiology
Özgür Appak, Selçuk Türkel, Nuran Esen, Ayşe Aydan Özkütük
The typing of non-tuberculous mycobacteria (NTM) is important from a clinical and epidemiological perspective. The polymerase chain reaction-restriction enzyme analysis (PRA) method and DNA sequence analysis method were utilized to target a gene region that codes the 65-kDa heat-shock protein for typing 150 suspected NTM samples isolated from the respiratory tract. Mycobacterium abscessus, Mycobacterium xenopi, Mycobacterium fortuitum, and Mycobacterium peregrinum were most frequently found by both methods...
July 16, 2018: Acta Microbiologica et Immunologica Hungarica
Hossein Kazemian, Hamid Heidari, Jalil Kardan Yamchi, Hengameh Zandi, Asieh Taji, Fateme Yazdani, Roya Ghanavati, Hossein Ali Rahdar, Mohammad Mehdi Feizabadi
BACKGROUND: Mycobacterium tuberculosis as an intracellular pathogen causes tuberculosis (TB). Due to the long time required for treatment, hepatotoxicity of drugs and also emergence of multidrug-resistant (MDR) and extremely drug resistant (XDR) strains, TB is currently a major public health problem. Some medicinal plants possess remarkable activity against Mycobacterium. Among them, Lamiaceae family are of pharmaceutical interest because of their potential antimicrobial properties. The aim of the study was to evaluate the in vitro activities of Satureja rechingeri, Satureja khuzestanica and Zataria multiflora against MDR M...
June 26, 2018: Recent Patents on Anti-infective Drug Discovery
Viviana P Lutzky, Champa N Ratnatunga, Daniel J Smith, Andreas Kupz, Denise L Doolan, David W Reid, Rachel M Thomson, Scott C Bell, John J Miles
The increasing global incidence and prevalence of non-tuberculous mycobacteria (NTM) infection is of growing concern. New evidence of person-to-person transmission of multidrug-resistant NTM adds to the global concern. The reason why certain individuals are at risk of NTM infections is unknown. Using high definition flow cytometry, we studied the immune profiles of two groups that are at risk of Mycobacterium abscessus complex infection and matched controls. The first group was cystic fibrosis (CF) patients and the second group was elderly individuals...
2018: Frontiers in Immunology
Hanako Fukano, Mitsunori Yoshida, Yuko Kazumi, Nagatoshi Fujiwara, Kinya Katayama, Yoshitoshi Ogura, Tetsuya Hayashi, Yuji Miyamoto, Noriki Fujimoto, Wang Hongsheng, Chisaki Mizumoto, Yusuke Koizumi, Hiroyoshi Maeda, Osamu Hiranuma, Satoshi Mitarai, Norihisa Ishii, Yoshihiko Hoshino
Among non-tuberculous mycobacteria (NTM), the Mycobacterium simiae complex is one of the largest groups, consisting of 18 species of slow-growing mycobacteria. In 2009, a case of NTM-associated infectious skin disease was reported in Shiga Prefecture, Japan. The patient presented with scattered nodules on the chest, back and extremities, and an M. simiae-like organism was isolated from skin biopsy specimens obtained from one of these lesions. Based on several assessments, including multiple-gene analyses, biochemical characterization and drug susceptibility testing, we concluded that this isolate represented a novel species of NTM, and proposed the name 'Mycobacterium shigaense'...
June 25, 2018: International Journal of Systematic and Evolutionary Microbiology
C Fordham von Reyn, C Robert Horsburgh
No abstract text is available yet for this article.
April 18, 2018: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
Jared Weston, Sushil Pandey, Evan Matthews, Evan Bursle
Introduction: We describe the first detailed case report of human infection with Mycobacterium stomatepiae . Infection with non-tuberculous mycobacteria (NTM) related to M. stomatepiae is well described, despite the lack of previous confirmed reports of M. stomatepiae- related human disease. Localised cervical lymphadenitis is the most common NTM disease in children, with species closely related to M. stomatepiae, such as Mycobacterium triplex and Mycobacterium florentinum , having been shown to be rare causative agents...
May 2018: JMM Case Reports
Thamer H Alenazi, Bashayer S Alanazi, Abdulrahman Alsaedy, Abdulmoneim Khair, Rifat Solomon, Sameera M Al Johani
Human immunodeficiency virus (HIV) infection usually presents with a wide range of manifestations. Although HIV patients are prone to pulmonary infections by opportunistic pathogens in the late stage of AIDS, manifesting the disease with pulmonary infections caused by Mycobacterium riyadhense (newly identified non-tuberculous mycobacteria) is extremely rare with only one case reported in the literature. We are describing two previously healthy patients who presented with M. riyadhense lung infection and were subsequently found to have HIV, illustrating the need for considering the possibility M...
June 5, 2018: Journal of Infection and Public Health
Takeshi Saraya, Kazuhito Fukuoka, Hideto Maruno, Yoshinori Komagata, Masachika Fujiwara, Shinya Kaname, Yoshihiro Arimura, Akira Yamada, Hajime Takizawa
BACKGROUND Rheumatoid arthritis tenosynovitis is difficult to discriminate from non-tuberculous tenosynovitis on the basis of radiological and pathological findings. CASE REPORT A 74-year-old woman with a 4-year history of rheumatoid arthritis was referred to our hospital to undergo treatment for uncontrollable tenderness and swelling in her right third metacarpophalangeal joint, right wrist, and left knee joint. In the previous year, she underwent surgery at a local hospital for the swelling in her right metacarpophalangeal joint, the information of which was not known precisely, but the swelling subsided in due course after an operation...
June 7, 2018: American Journal of Case Reports
José Javier Costa-Alcalde, Gema Barbeito-Castiñeiras, José María González-Alba, Antonio Aguilera, Juan Carlos Galán, María Luisa Pérez-Del-Molino
INTRODUCTION: The American Thoracic Society and the Infectious Diseases Society of America recommend that clinically significant non-tuberculous mycobacteria (NTM) should be identified to the species level in order to determine their clinical significance. The aim of this study was to evaluate identification of rapidly growing NTM (RGM) isolated from clinical samples by using MALDI-TOF MS and a commercial molecular system. The results were compared with identification using a reference method...
June 2, 2018: Enfermedades Infecciosas y Microbiología Clínica
Dinah B Aziz, Jeanette W P Teo, Véronique Dartois, Thomas Dick
Lung disease caused by non-tuberculous mycobacteria (NTM), relatives of Mycobacterium tuberculosis , is increasing. M. abscessus is the most prevalent rapid growing NTM. This environmental pathogen is intrinsically resistant to most commonly used antibiotics, including anti-tuberculosis drugs. Current therapies take years to achieve cure, if cure if achieved. Thus, there is an urgent medical need to identify new, more efficacious treatments. Here, we explore the possibility of repurposing antibiotics developed for other indications...
2018: Frontiers in Microbiology
Jimin Zhang, Franziska Leifer, Sasha Rose, Dung Yu Chun, Jill Thaisz, Tracey Herr, Mary Nashed, Jayanthi Joseph, Walter R Perkins, Keith DiPetrillo
Non-tuberculous mycobacteria (NTM) cause pulmonary infections in patients with structural lung damage, impaired immunity, or other risk factors. Delivering antibiotics to the sites of these infections is a major hurdle of therapy because pulmonary NTM infections can persist in biofilms or as intracellular infections within macrophages. Inhaled treatments can improve antibiotic delivery into the lungs, but efficient nebulization delivery, distribution throughout the lungs, and penetration into biofilms and macrophages are considerable challenges for this approach...
2018: Frontiers in Microbiology
Lázaro M Marques-Neto, Monalisa M Trentini, Rogério C das Neves, Danilo P Resende, Victor O Procopio, Adeliane C da Costa, André Kipnis, Márcia R Mortari, Elisabeth F Schwartz, Ana Paula Junqueira-Kipnis
Mycobacterium massiliense is a rapid growing, multidrug-resistant, non-tuberculous mycobacteria that is responsible for a wide spectrum of skin and soft tissue infections, as well as other organs, such as the lungs. Antimicrobial peptides had been described as broad-spectrum antimicrobial, chemotactic, and immunomodulator molecules. In this study we evaluated an antimicrobial peptide derived from scorpion Tityus obscurus as an anti-mycobacterial agent in vitro and in vivo. Bioinformatics analyses demonstrated that the peptide ToAP2 have a conserved region similar to several membrane proteins, as well as mouse cathelicidin...
May 30, 2018: Toxins
Bright Varghese, Mushira Enani, Mohammed Shoukri, Sameera AlJohani, Hawra Al Ghafli, Sahar AlThawadi, Sahal Al Hajoj
BACKGROUND: Incidences of nontuberculous mycobacteria (NTM) causing pulmonary and extrapulmonary diseases are reportedly increasing globally and the current epidemiologic situation in Saudi Arabia remains unclear. To study such trend, we carried out a nationwide systematic epidemiological study focusing on NTM diseases for the first time in the country. METHODS/PRINCIPLE FINDINGS: A nationwide collection of NTM isolates with clinical and demographical data was conducted for a period of 24 months...
May 2018: PLoS Neglected Tropical Diseases
Albert Y H Lim, Sanjay H Chotirmall, Eric T K Fok, Akash Verma, Partha P De, Soon Keng Goh, Ser Hon Puah, Daryl E L Goh, John A Abisheganaden
BACKGROUND: Non-tuberculous mycobacteria (NTM) infection is an increasing problem worldwide. The epidemiology of NTM in most Asian countries is unknown. This study investigated the epidemiology, and clinical profile of inpatients in whom NTM was isolated from various anatomical sites in a Singaporean population attending a major tertiary referral centre. METHODS: Demographic profile, clinical data, and characteristics of patients hospitalized with NTM isolates at a major tertiary hospital over two-year period were prospectively assessed (2011-2012)...
May 22, 2018: BMC Pulmonary Medicine
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
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
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
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 nontuberculous mycobacteria (NTM) to many antibiotics, the treatment of diseases caused by NTM is often long-term but unsuccessful. The main goal of this study was to evaluate the in vitro susceptibilities 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...
July 2018: Antimicrobial Agents and Chemotherapy
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
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