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multidrug resistant tuberculosis

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https://www.readbyqxmd.com/read/28230095/genetic-diversity-transmission-dynamics-and-drug-resistance-of-mycobacterium-tuberculosis-in-angola
#1
João Perdigão, Sofia Clemente, Jorge Ramos, Pedro Masakidi, Diana Machado, Carla Silva, Isabel Couto, Miguel Viveiros, Nuno Taveira, Isabel Portugal
Tuberculosis (TB) poses a serious public health problem in Angola. No surveillance data on drug resistance is available and nothing is known regarding the genetic diversity and population structure of circulating Mycobacterium tuberculosis strains. Here, we have genotyped and evaluated drug susceptibility of 89 Mycobacterium tuberculosis clinical isolates from Luanda. Thirty-three different spoligotype profiles corresponding to 24 different Shared International Types (SIT) and 9 orphan profiles were detected...
February 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28225541/perceived-barriers-to-adherence-to-tuberculosis-infection-control-measures-among-health-care-workers-in-the-dominican-republic
#2
Helena J Chapman, Bienvenido A Veras-Estévez, Jamie L Pomeranz, Eddy N Pérez-Then, Belkys Marcelino, Michael Lauzardo
INTRODUCTION Health care workers have an increased risk of infection due to occupational Mycobacterium tuberculosis exposure, including multidrug-resistant strains. Health care workers' risk of developing tuberculosis is greater than that of the general population, whether in low-, intermediate- or high-incidence countries. Adherence to infection control measures (administrative controls, environmental controls, and personal respiratory protection) is essential to reduce risk of disease transmission between suspected tuberculosis patients and health care workers, but for different reasons, both objective and subjective, adherence is low...
January 2017: MEDICC Review
https://www.readbyqxmd.com/read/28225540/antituberculosis-drug-resistance-in-pulmonary-isolates-of-mycobacterium-tuberculosis-cuba-2012-2014
#3
Dihadenys Lemus, Miguel Echemendía, Raúl Díaz, María J Llanes, Lourdes Suárez, Antonio Marrero
INTRODUCTION Systematic surveillance of antituberculosis drug resistance allows identification of multidrug-resistant and extensively drug-resistant isolates of Mycobacterium tuberculosis. Surveillance studies of antituberculosis drug resistance systematically conducted in Cuba for over 15 years have revealed low circulation of multidrug-resistant tuberculosis, under 1% in new cases. OBJECTIVE Characterize antituberculosis drug resistance in isolates of M. tuberculosis recovered from patients with pulmonary tuberculosis in Cuba in 2012-2014...
January 2017: MEDICC Review
https://www.readbyqxmd.com/read/28225345/results-of-xpert-%C3%A2-mtb-rif-implementation-in-kyrgyzstan
#4
G Kurbaniyazova, M Joncevska, S Kalon, G Kalmambetova, T Mohr, A Toktogonova, K Takieva, K M Monirul Islam, F Luelmo
INTRODUCTION: In July 2012, the United States Agency for International Development (USAID) Quality Health Care Project introduced the Xpert® MTB/RIF assay at the facility level of the primary health care system in Kyrgyzstan. This study analysed the results of the implementation of Xpert. MATERIALS AND METHODS: Test results from 2734 patients from July 2012 to December 2014 were analysed. The sensitivity and specificity of Xpert in routine programme conditions were evaluated using culture and phenotypic drug susceptibility testing (DST) as gold standard...
March 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28225342/outcomes-from-the-first-multidrug-resistant-tuberculosis-programme-in-kenya
#5
H Huerga, M Bastard, M Kamene, S Wanjala, A Arnold, N Oucho, I Chikwanha, F Varaine
SETTING: In March 2006, the first multidrug-resistant tuberculosis (MDR-TB) treatment programme was implemented in Kenya. OBJECTIVE: To describe patients' treatment outcomes and adverse events. DESIGN: A retrospective case note review of patients started on MDR-TB treatment at two Médecins Sans Frontières-supported sites and the national referral hospital of Kenya was undertaken. Sites operated an ambulatory model of care. Patients were treated for a minimum of 24 months with at least 4-5 drugs for the intensive phase of treatment, including an injectable agent...
March 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28225341/patterns-of-drug-resistance-among-patients-with-tuberculous-pleural-effusion-in-greece
#6
V Anastasakos, V Skouras, C Moschos, S Tsikrika, S Karabela, I Marinou, E Vogiatzakis, K Konstantinou, A Papavasiliou, I Kalomenidis
SETTING: Data on the relationship between pleural tuberculosis (TB) and anti-tuberculosis drug resistance are scarce. OBJECTIVE: To determine the patterns of drug resistance among pleural Mycobacterium tuberculosis isolates in Greece and the incidence of tuberculous pleural effusion (TPE) among patients with multidrug-resistant (MDR) or extensively drug-resistant (XDR) pulmonary TB. DESIGN: Drug susceptibility testing (DST) results recorded in the database of the National Reference Centre for Tuberculosis in Athens, Greece, over a 9-year period (2003-2011) were reviewed...
March 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28225340/pattern-of-first-and-second-line-drug-resistance-among-pulmonary-tuberculosis-retreatment-cases-in-pakistan
#7
A Javaid, R Hasan, A Zafar, M A Chaudry, S Qayyum, E Qadeer, Z Shaheen, N Agha, N Rizvi, M Z Afridi, M K Chima, A R Khan, A Ghafoor, S Khan, S R Awan, S Akhtar, K Choudry, Z H Iqbal, M Ansarie, N Ahmad
BACKGROUND: Drug resistance in general, and multidrug-resistant tuberculosis (MDR-TB) in particular, threatens global tuberculosis (TB) control efforts. Population-based estimates of drug resistance are needed to develop strategies for controlling drug-resistant TB in Pakistan. OBJECTIVE: To obtain population-based data on Mycobacterium tuberculosis drug resistance in Pakistan. METHODS: To obtain drug resistance data, we conducted a population-based study of TB cases in all provinces of Pakistan...
March 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28225339/latent-tuberculous-infection-in-household-contacts-of-multidrug-resistant-and-newly-diagnosed-tuberculosis
#8
G J Fox, N T Anh, N V Nhung, N T Loi, N B Hoa, L T Ngoc Anh, N K Cuong, T N Buu, G B Marks, D Menzies
BACKGROUND: Differences in the prevalence of latent tuberculous infection (LTBI) and tuberculosis (TB) disease among contacts of patients with multidrug-resistant TB (MDR-TB) and drug-susceptible TB are not well understood. OBJECTIVE: To compare the prevalence of tuberculin skin test (TST) positivity in household contacts of patients with MDR-TB and in contacts of patients never previously treated for TB ('new TB'). DESIGN: Consecutive patients with MDR-TB and their household contacts at nine urban district clinics in Viet Nam were screened for TB and LTBI, and followed up for 6 months...
March 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28225336/paediatric-tuberculosis-in-queensland-australia-overrepresentation-of-cross-border-and-indigenous-children
#9
E J Donnan, C Coulter, G Simpson, J Clark, C Nourse
SETTING: Queensland, Australia. BACKGROUND: Understanding paediatric tuberculosis (TB) is important, as children with TB typically reflect recent community transmission. Children pose unique diagnostic challenges and are at risk of developing severe disseminated infection. OBJECTIVE: To describe the epidemiology, presentation and outcomes of children with TB disease in Queensland. DESIGN: This is a retrospective case series of children diagnosed with TB aged 0-16 years notified in 2005-2014...
March 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28223393/novel-bacterial-topoisomerase-inhibitors-with-potent-broad-spectrum-activity-against-drug-resistant-bacteria
#10
Cédric Charrier, Anne-Marie Salisbury, Victoria J Savage, Thomas Duffy, Emmanuel Moyo, Nathan Chaffer-Malam, Nicola Ooi, Rebecca Newman, Jonathan Cheung, Richard Metzger, David McGarry, Mark Pichowicz, Ralph Sigerson, Ian R Cooper, Gary Nelson, Hayley S Butler, Mark Craighead, Andrew J Ratcliffe, Stuart A Best, Neil R Stokes
The Novel Bacterial Topoisomerase Inhibitor class is an investigational type of antibacterial inhibitor of DNA gyrase and topoisomerase IV that do not have cross-resistance with the quinolones. Here, we report the evaluation of the in vitro properties of a new series of this type of small molecules. Exemplar compounds selectively and potently inhibited the catalytic activities of Escherichia coli DNA gyrase and topoisomerase IV but did not block the DNA breakage-reunion step. Compounds showed broad-spectrum inhibitory activity against a wide range of Gram-positive and Gram-negative pathogens, including biodefence microorganisms, and Mycobacterium tuberculosis No cross-resistance with quinolone-resistant Staphylococcus aureus and E...
February 21, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28223391/evaluation-of-para-aminosalicylic-acid-pas-as-a-substrate-of-multiple-solute-carrier-slc-uptake-transporters-and-possible-drug-interactions-with-nsaids-in-vitro
#11
Md Masud Parvez, Ho Jung Shin, Jin Ah Jung, Jae-Gook Shin
para-Aminosalicylic acid (PAS) is a second-line anti-tuberculosis drug used to treat multidrug-resistant and extensively drug-resistant tuberculosis for more than 60 years. Renal secretion and glomerular filtration are the major pathways for elimination of PAS. We comprehensively studied PAS transport by using cell lines that overexpressed various transporters, and found that PAS acts as a novel substrate of organic anionic polypeptide (OATP1B1), organic cationic transporters (OCT1 and OCT2), and organic anion transporters (OAT1 and OAT3) but not a substrate of any ATP-binding cassette (ABC) transporters...
February 21, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28222724/financial-barriers-and-coping-strategies-a-qualitative-study-of-accessing-multidrug-resistant-tuberculosis-and-tuberculosis-care-in-yunnan-china
#12
C Hutchison, M S Khan, J Yoong, X Lin, R J Coker
BACKGROUND: Tuberculosis (TB) and multidrug-resistance tuberculosis (MDR-TB) pose serious challenges to global health, particularly in China, which has the second highest case burden in the world. Disparities in access to care for the poorest, rural TB patients may be exacerbated for MDR-TB patients, although this has not been investigated widely. We examine whether certain patient groups experience different barriers to accessing TB services, whether there are added challenges for patients with MDR-TB, and how patients and health providers cope in Yunnan, a mountainous province in China with a largely rural population and high TB burden...
February 22, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28221108/pnca-gene-mutations-associated-with-pyrazinamide-resistance-in-drug-resistant-tuberculosis-south-africa-and-georgia
#13
Salim Allana, Elena Shashkina, Barun Mathema, Nino Bablishvili, Nestani Tukvadze, N Sarita Shah, Russell R Kempker, Henry M Blumberg, Pravi Moodley, Koleka Mlisana, James C M Brust, Neel R Gandhi
Although pyrazinamide is commonly used for tuberculosis treatment, drug-susceptibility testing is not routinely available. We found polymorphisms in the pncA gene for 70% of multidrug-resistant and 96% of extensively drug-resistant Mycobacterium tuberculosis isolates from South Africa and Georgia. Assessment of pyrazinamide susceptibility may be prudent before using it in regimens for drug-resistant tuberculosis.
March 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28214557/quadruple-first-line-drug-resistance-in-mycobacterium-tuberculosis-in-vietnam-what-can-we-learn-from-genes
#14
Huy Quang Nguyen, Nhung Viet Nguyen, Lucie Contamin, Thanh Hoa Thi Tran, Thuong Thi Vu, Hung Van Nguyen, Ngoc Lan Thi Nguyen, Son Thai Nguyen, Anh Duc Dang, Anne-Laure Bañuls, Van Anh Thi Nguyen
In Vietnam, a country with high tuberculosis (137/100.000 population) and multidrug-resistant (MDR)-TB burdens (7.8/100.000 population), little is known about the molecular signatures of drug resistance in general and more particularly of second line drug (SLD) resistance. This study is specifically focused on Mycobacterium tuberculosis isolates resistant to four first-line drugs (FLDs) that make TB much more difficult to treat. The aim is to determine the proportion of SLD resistance in these quadruple drug resistant isolates and the genetic determinants linked to drug resistance to better understand the genetic processes leading to quadruple and extremely drug resistance (XDR)...
February 15, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28214232/new-nitrofurans-amenable-by-isocyanide-multicomponent-chemistry-are-active-against-multidrug-resistant-and-poly-resistant-mycobacterium-tuberculosis
#15
Mikhail Krasavin, Vladislav Parchinsky, Grigory Kantin, Olga Manicheva, Marine Dogonadze, Tatiana Vinogradova, Bianka Karge, Mark Brönstrup
A set of structurally diverse N-amino δ-lactams decorated with a 5-nitro-2-furyl moiety was synthesized using isocyanide-based multicomponent chemistry and evaluated for antibacterial activity. Three compounds displayed a selective and potent (MIC 22-33μM) inhibition of M. tuberculosis H37Rv strain growth, while other Gram-positive (MRSA and E. faecium) or Gram-negative (E. coli, P. aeruginosa, A. baumannii, K. pneumoniae) pathogens were not affected. The compounds also displayed moderate-low cytotoxicity, as demonstrated in cell line viability assays...
February 4, 2017: Bioorganic & Medicinal Chemistry
https://www.readbyqxmd.com/read/28202091/isolation-unit-for-multidrug-resistant-tuberculosis-patients-in-a-low-endemic-country-a-step-towards-the-world-health-organization-end-tb-strategy
#16
M C Payen, J P VAN Vooren, O Vandenberg, N Clumeck, S DE Wit
Tuberculosis (TB) remains a threat to public health and is the second cause of death due to a single infectious agent after HIV/AIDS. The worldwide distribution of TB is heterogeneous. The incidence is decreasing in most high-income regions, but the situation remains worrying in many parts of the world. The emergence of Mycobacterium tuberculosis strains resistant to key agents used in treatment (rifampin and isoniazid) contributes to TB transmission around the world. To achieve TB elimination, both high and low endemic countries must upscale their efforts to decrease disease transmission and improve cure rates...
February 16, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28199375/has-universal-screening-with-xpert%C3%A2-mtb-rif-increased-the-proportion-of-multidrug-resistant-tuberculosis-cases-diagnosed-in-a-routine-operational-setting
#17
Pren Naidoo, Rory Dunbar, Judy Caldwell, Carl Lombard, Nulda Beyers
SETTING: Primary health services in Cape Town, South Africa where the introduction of Xpert® MTB/RIF (Xpert) enabled simultaneous screening for tuberculosis (TB) and drug susceptibility in all presumptive cases. STUDY AIM: To compare the proportion of TB cases with drug susceptibility tests undertaken and multidrug-resistant tuberculosis (MDR-TB) diagnosed pre-treatment and during the course of 1st line treatment in the previous smear/culture and the newly introduced Xpert-based algorithms...
2017: PloS One
https://www.readbyqxmd.com/read/28197340/phenotypic-and-genotypic-analysis-of-multidrug-resistant-mycobacterium-tuberculosis-isolates-from-sudanese-patients
#18
Solima M A Sabeel, Mohamed Ahmed Salih, Manasik Ali, Salah-Eldin El-Zaki, Nadir Abuzeid, Zeinab Abubaker Mohammed Elgadi, Hisham N Altayb, Asrar M A Elegail, Nuha Y Ibrahim, Bahaeldin K Elamin
Background. Currently, mutations in rpoB, KatG, and rrs genes and inhA promoter were considered to be involved in conferring resistance to rifampicin, isoniazid, and streptomycin in Mycobacterium tuberculosis (MTB). Objective. The aims of this study were to detect the prevalence of first-line tuberculosis (TB) drug resistance among a group of previously treated and newly detected TB patients, to determine the association between prevalence of multidrug resistance (MDR) and demographic information (age and sex), to explain genes correlated with MDR Mycobacterium tuberculosis, and to characterize MTB via 16S ribosomal RNA (16S rRNA) analysis...
2017: Tuberculosis Research and Treatment
https://www.readbyqxmd.com/read/28193240/substitution-of-ethambutol-with-linezolid-during-the-intensive-phase-of-treatment-of-pulmonary-tuberculosis-study-protocol-for-a-prospective-multicenter-randomized-open-label-phase-ii-trial
#19
Ji Yeon Lee, Deog Kyeom Kim, Jung-Kyu Lee, Ho Il Yoon, Ina Jeong, Eunyoung Heo, Young Sik Park, Jae Ho Lee, Sung Soo Park, Sang-Min Lee, Chang-Hoon Lee, Jinwoo Lee, Sun Mi Choi, Jong Sun Park, Joon-Sung Joh, Young-Jae Cho, Yeon Joo Lee, Se Joong Kim, Young Ran Hwang, Hyeonjeong Kim, Jongeun Ki, Hyungsook Choi, Jiyeon Han, Heejung Ahn, Seokyung Hahn, Jae-Joon Yim
BACKGROUND: Linezolid, an oxazolidinone, substantially improves treatment outcomes of multidrug-resistant tuberculosis and extensively drug-resistant tuberculosis. We started a trial to test whether the use of linezolid instead of ethambutol could increase the rate of sputum culture conversion as of 8 weeks of treatment in patients with drug-susceptible tuberculosis. METHODS/DESIGN: This is a phase II, multicenter, randomized study with three arms. We are enrolling patients with pulmonary tuberculosis without rifampicin resistance screened by the Xpert MTB/RIF® assay...
February 13, 2017: Trials
https://www.readbyqxmd.com/read/28188122/drug-resistance-detection-and-mutation-patterns-of-multidrug-resistant-tuberculosis-strains-from-children-in-delhi
#20
Jyoti Arora, Ritu Singhal, Manpreet Bhalla, Ajoy Verma, Niti Singh, Digamber Behera, Rohit Sarin, Vithal Prasad Myneedu
A total of 312 sputum samples from pediatric patients presumptive of multidrug resistant tuberculosis were tested for the detection of drug resistance using the GenoTypeMTBDRplus assay. A total of 193 (61.8%) patients were smear positive and 119 (38.1%) were smear negative by Ziehl-Neelsen staining. A line probe assay was performed for 208 samples/cultures (193 smear positive samples and 15 cultures from smear negative samples). Valid results were obtained from 198 tests. Some 125/198 (63.1%) were sensitive to both rifampicin (RIF) and isoniazid (INH), while 73/198 (36...
February 7, 2017: Journal of Epidemiology and Global Health
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