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Tuberculosis transmission

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https://www.readbyqxmd.com/read/28807917/bedaquiline-inhibits-the-atp-synthase-in-mycobacterium-abscessus-and-is-effective-in-infected-zebrafish
#1
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/28802412/mycobacterium-tuberculosis-sige-mutant-st28-used-as-a-vaccine-induces-protective-immunity-in-the-guinea-pig-model
#2
JoLynn Troudt, Elizabeth Creissen, Linda Izzo, Helle Bielefeldt-Ohmann, Stefano Casonato, Riccardo Manganelli, Angelo A Izzo
With more than 9 million new infections and 1.5 million deaths claimed every year, tuberculosis remains one of the major scourges of humankind. The only vaccine available against this disease, the attenuated strain Mycobacterium bovis, BCG is effective against severe forms of the disease in infants, but scarcely effective in protecting adults from the pulmonary form of the disease, thus not stopping transmission. Consequently, the development of an effective anti-tuberculosis vaccine is a major goal for improving global health...
September 2017: Tuberculosis
https://www.readbyqxmd.com/read/28802411/the-minipig-as-an-animal-model-to-study-mycobacterium-tuberculosis-infection-and-natural-transmission
#3
Laylaa Ramos, Andres Obregon-Henao, Marcela Henao-Tamayo, Richard Bowen, Joan K Lunney, Mercedes Gonzalez-Juarrero
In endemic countries more than 20% of tuberculosis (TB) cases are in infants and children. Current animal models study TB during adulthood but animal models for infant TB are scarce. Here we propose that minipigs can be used as an animal model to study adult, adolescent and infant TB including natural transmission. In these studies, two-month old minipigs (representing infant age in humans) and six-month old minipigs (representing adolescence in humans) were infected via the aerosol route with hyper-virulent clinical strain W-Beijing Mycobacterium tuberculosis (Mtb) HN878 and were monitored for 11 or 36 weeks post-challenge, respectively...
September 2017: Tuberculosis
https://www.readbyqxmd.com/read/28802410/evaluation-of-24-locus-miru-vntr-genotyping-in-mycobacterium-tuberculosis-cluster-investigations-in-four-jurisdictions-in-the-united-states-2006-2010
#4
Larry D Teeter, J Steven Kammerer, Smita Ghosh, Duc T M Nguyen, Padmaja Vempaty, Jane Tapia, Roque Miramontes, Wendy A Cronin, Edward A Graviss
The U.S. Centers for Disease Control and Prevention (CDC) uses a combination of spacer oligonucleotide typing (spoligotyping) and mycobacterial interspersed repetitive units-variable number of tandem repeats (MIRU-VNTR) analyses as part of the National TB Genotyping Service (NTGS). The NTGS expansion from 12-locus MIRU-VNTR (MIRU12) to 24-locus MIRU-VNTR (MIRU24) in 2009 enhanced the ability to discriminate Mycobacterium tuberculosis strains. In the current study, we investigated the MIRU24 concordance among epidemiologic-linked tuberculosis (TB) patients in four U...
September 2017: Tuberculosis
https://www.readbyqxmd.com/read/28800420/retention-in-medication-assisted-treatment-programs-in-ukraine-identifying-factors-contributing-to-a-continuing-hiv-epidemic
#5
Kostyantyn Dumchev, Sergii Dvoryak, Olena Chernova, Olga Morozova, Frederick L Altice
BACKGROUND: Opioid agonist treatments (OAT) are widely-used, evidence-based strategies for treating opioid dependence and reducing HIV transmission. The positive benefits of OAT are strongly correlated with time spent in treatment, making retention a key indicator for program quality. This study assessed patient retention and associated factors in Ukraine, where OAT was first introduced in 2004. METHODS: Data from clinical records of 2916 patients enrolled in OAT at thirteen sites from 2005 to 2012 were entered into an electronic monitoring system...
August 8, 2017: International Journal on Drug Policy
https://www.readbyqxmd.com/read/28797184/late-presentation-hiv-aids-are-still-a-challenge-in-brazil-and-worldwide
#6
Shirley Komninakis, Magaly Lima Mota, James Richard Hunter, Ricardo Sobhie Diaz
Despite all the efforts to contain the HIV/AIDS epidemics there still are individuals of unknown diagnosis. These present high risk of mortality, and following diagnosis respond very poorly to treatment. Late testing also represents a reduced opportunity in controlling the transmission of HIV and causes an indirect increase in the transmission rates of other diseases, such as tuberculosis. In European countries, as well as in the United States, a great number of people, represented specially by illegal immigrants, black individuals and women markedly present at a later state of infection...
August 11, 2017: AIDS Research and Human Retroviruses
https://www.readbyqxmd.com/read/28794425/transmission-is-a-noticeable-cause-of-resistance-among-treated-tuberculosis-patients-in-shanghai-china
#7
Chijioke A Nsofor, Qi Jiang, Jie Wu, Mingyu Gan, Qingyun Liu, Tianyu Zuo, Guofeng Zhu, Qian Gao
It is generally believed that drug resistance among treated tuberculosis (TB) patients is as a result of acquired drug resistance due to inappropriate treatment. Previous studies have shown that primary drug resistance caused by transmission also plays a role among treated cases. Differentiating the two types of drug resistance will help in developing appropriate strategies for control of drug resistant tuberculosis. In this study, we tested the hypothesis that drug resistance among treated TB patients is mainly caused by primary resistance rather than acquired resistance...
August 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28793935/utilization-of-electronic-health-record-events-to-conduct-a-tuberculosis-contact-investigation-in-a-high-risk-oncology-unit
#8
Shauna C Usiak, Fabian A Romero, Patrice Schwegman, Violet Fitzpatrick, MaryAnn Connor, Janet Eagan, Arthur E Brown, Mini Kamboj
OBJECTIVE To describe the utilization of electronic medical data resources, including health records and nursing scheduling resources, to conduct a tuberculosis (TB) exposure investigation in a high-risk oncology unit. SETTING A 42-bed inpatient unit with a mix of surgical and medical patients at a large tertiary-care cancer center in New York City. PARTICIPANTS High-risk subjects and coworkers exposed to a healthcare worker (HCW) with cavitary smear positive lung TB. RESULTS During the 3-month exposure period, 270 patients were admitted to the unit; 137 of these (50...
August 10, 2017: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/28793025/environmental-aspects-related-to-tuberculosis-and-intestinal-parasites-in-a-low-income-community-of-the-brazilian-amazon
#9
Biatriz Araújo Cardoso, Fabio de Oliveira Fonseca, Antonio Henrique Almeida de Moraes, Ana Caroline Guedes Souza Martins, Nissa Vilhena da Silva Oliveira, Luana Nepomuceno Gondim Costa Lima, George Alberto da Silva Dias, Maria Helena Féres Saad
We carried out a cross-sectional study from January to December 2015 on 1,425 inhabitants from a floating population in the Brazilian Amazon (Murinin district, Pará State) to describe the population-based prevalence of tuberculosis (TB) from 2011 to 2014, recent TB contacts (rCts) latently infected with Mycobacterium tuberculosis (LTBI) , the coverage of the local health network, socio-environmental factors, and frequency of intestinal parasitic infection (IPI). We found that the sanitary structure was inadequate, with latrines being shared with other rooms within the same accommodation; well water was the main source of water, and 48% of families had low incomes...
August 7, 2017: Revista do Instituto de Medicina Tropical de São Paulo
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
#10
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/28790871/estimating-the-effect-of-lay-knowledge-and-prior-contact-with-pulmonary-tb-patients-on-health-belief-model-in-a-high-risk-pulmonary-tb-transmission-population
#11
Rizqy Amelia Zein, Fendy Suhariadi, Wiwin Hendriani
OBJECTIVE: The research aimed to investigate the effect of lay knowledge of pulmonary tuberculosis (TB) and prior contact with pulmonary TB patients on a health-belief model (HBM) as well as to identify the social determinants that affect lay knowledge. METHODS: Survey research design was conducted, where participants were required to fill in a questionnaire, which measured HBM and lay knowledge of pulmonary TB. Research participants were 500 residents of Semampir, Asemrowo, Bubutan, Pabean Cantian, and Simokerto districts, where the risk of pulmonary TB transmission is higher than other districts in Surabaya...
2017: Psychology Research and Behavior Management
https://www.readbyqxmd.com/read/28789982/mycobacterium-tuberculosis-genotypes-and-predominant-clones-among-the-multidrug-resistant-isolates-in-spain-1998-2005
#12
Sofía Samper, Patricia Gavín, Isabel Millán, María José Iglesias, María Soledad Jiménez, David Couvin, Nalin Rastogi
Although the incidence of tuberculosis (TB) is gradually decreasing in Spain, there is an increase in the proportion of foreign-born cases. This changing scenario is slowly shifting the local TB epidemiology from endemic to imported cases with an increased risk for multidrug-resistant (MDR) and extensively drug resistant (XDR) strains of Mycobacterium tuberculosis complex. MDR/XDR strains from Spain (n=366 MTBC isolates, 1 strain per patient) isolated between 1998 and 2005 were retained for this retrospective analysis...
August 5, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28776530/rapid-laboratory-diagnosis-of-pulmonary-tuberculosis
#13
Prasanna Bhirud, Ameeta Joshi, Nilma Hirani, Abhay Chowdhary
BACKGROUND: Tuberculosis (TB) ranks as the second leading cause of death from an infectious disease worldwide. Early diagnosis of Mycobacterium tuberculosis in clinical samples becomes important in the control of TB both for the treatment of patients and for curbing of disease transmission to the others in the community. The study objective was to perform Ziehl-Neelsen (ZN) staining, fluorochrome staining, line probe assay (LPA), and loop-mediated isothermal amplification (LAMP) assay for rapid detection of pulmonary TB (PTB) and to compare the results of LPA and LAMP in terms of sensitivity, specificity, and turnaround time...
July 2017: International Journal of Mycobacteriology
https://www.readbyqxmd.com/read/28771459/solid-organ-transplant-transmitted-tuberculosis-linked-to-a-community-outbreak-california-2015
#14
Alexander Kay, Pennan M Barry, Pallavi Annambhotla, Carol Greene, Martin Cilnis, Peter Chin-Hong, Nicholas Arger, Louise McNitt, Nikole Neidlinger, Neha Shah, Sridhar V Basavaraju, Matthew Kuehnert, Tambi Shaw
In the spring of 2015, a local health department (LHD) in county A notified the California Department of Public Health (CDPH) about three adults with close ties to one another and a congregate community site who had received diagnoses of tuberculosis (TB) disease within a 3-month period. Subsequent review revealed matching TB genotypes indicating that the cases were likely part of a chain of TB transmission. Only three TB cases in California in the preceding 2 years shared this same genotype. One of those three previous cases occurred in a lung-transplant recipient who had no identified epidemiologic links to the outbreak...
August 4, 2017: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/28760681/genetic-diversity-of-mycobacterium-tuberculosis-and-transmission-associated-with-first-line-drug-resistance-a-first-analysis-in-jalisco-mexico
#15
Gladys Lopez-Avalos, Guadalupe Gonzalez-Palomar, Martín Lopez-Rodriguez, Carlos Arturo Vazquez-Chacon, Gustavo Mora-Aguilera, Juan Antonio Gonzalez-Barrios, Juan Carlos Villanueva-Arias, Manuel Sandoval-Diaz, Ulises Miranda-Hernández, Ikuri Alvarez-Maya
OBJECTIVES: To analyze the frequency of gene mutations associated to drug resistant in clinical samples from population of the Jalisco state (Mexico) and then evaluate the genetic variability of TB and MDR-TB strains to describe the frequency of M. tuberculosis families. METHODS: We analyzed the clinical isolates of M. tuberculosis obtained from Jalisco state of Mexico. Isolates were subjected to drug susceptibility testing and mutations were characterized by sequencing, followed by genotyping using spoligotyping and Interspersed Repetitive Units-Variable Number of Tandem Repeat (MIRU-VNTR)...
July 28, 2017: Journal of Global Antimicrobial Resistance
https://www.readbyqxmd.com/read/28758017/towards-an-ideal-antiretroviral-regimen-for-the-global-hiv-epidemic
#16
EDITORIAL
Beatriz Grinsztejn, Lara E Coelho, Paula M Luz, Valdilea G Veloso
Currently, immediate initiation of antiretroviral therapy (ART) is recommended for all individuals with HIV infection. However, among the 37 million people estimated to be living with HIV/AIDS, only 17 million are actively on treatment. Optimal use of ART among HIV-infected and at-risk individuals reduces morbidity, mortality, transmission and acquisition of HIV infection. ART regimen choices are affected by factors such as economic differences between resource-rich and low- and middle-income countries (LIMC), drug availability, and considerations for use in special populations...
July 1, 2017: Journal of Virus Eradication
https://www.readbyqxmd.com/read/28756786/negative-latent-tuberculosis-at-time-of-incarceration-identifying-a-very-high-risk-group-for-infection
#17
L Arroyave, Y Keynan, L López, D Marin, M P Arbeláez, Z V Rueda
The main aim was to measure the incidence of latent tuberculosis infection (LTBI) and identify risk factors associated with infection. In addition, we determined the number needed to screen (NNS) to identify LTBI and active tuberculosis. We followed 129 prisoners for 2 years following a negative two-step tuberculin skin test (TST). The cumulative incidence of TST conversion over 2 years was 29·5% (38/129), among the new TST converters, nine developed active TB. Among persons with no evidence of LTBI, the NNS to identify a LTBI case was 3·4 and an active TB case was 14·3...
September 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28752666/mannich-ketones-as-possible-antimycobacterial-agents
#18
Zsolt Lutz, Katalin Orbán, Ágnes Bóna, László Márk, Gábor Maász, László Prókai, Lázló Seress, Tamás Lóránd
Twenty-three known unsaturated and fused Mannich ketones and their reduced derivatives (amino alcohols) were selected for an antituberculotic study. They were screened against several mycobacterial strains including Mycobacterium tuberculosis, M. xenopi, and M. gordonae, and minimum inhibitory concentration values were also determined using the standard antituberculotic drug isoniazid (INH) as a reference. Structure-activity relationships were also studied. The mode of action of the test compounds was investigated using transmission electron microscopy, high-performance liquid chromatography, and matrix-assisted desorption/ionization mass spectrometry...
July 28, 2017: Archiv der Pharmazie
https://www.readbyqxmd.com/read/28749750/microbial-offense-vs-host-defense-who-controls-the-tb-granuloma
#19
Amanda J Martinot
The granuloma is the hallmark of tuberculosis and simultaneously signifies acquisition of an infection and induction of a host immune response. But who benefits more from the development of the granuloma, the host or the pathogen? Is microbe or man dictating disease course and progression? Mycobacterial diseases affect humans and animals alike, and the concepts presented in this review reflect host-pathogen interactions that influence not only mycobacterial granulomas in humans and animals but also other infectious granulomatous diseases that are encountered in veterinary medicine...
January 1, 2017: Veterinary Pathology
https://www.readbyqxmd.com/read/28749286/detection-of-aerosolized-bacteria-in-expired-air-samples-from-asian-elephants-elephas-maximus
#20
Sophie M Burke, Larry Vogelnest, Paul Thompson, Euan R Tovey, Peter Williamson
Elephant-mediated transmission of tuberculosis is assumed to be similar to human models, which state close and prolonged contact with an infected individual is required for transmission. Although considered a risk factor for infection, several case studies have reported that close contact with an elephant is not always necessary for transmission, and the role of aerosolized bacteria remains unclear. To investigate aerosol-mediated transmission of pathogenic bacteria from elephants, a method for the detection of aerosols using an adapted sampling system was developed...
June 2017: Journal of Zoo and Wildlife Medicine: Official Publication of the American Association of Zoo Veterinarians
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