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Tuberculosis transmission

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https://www.readbyqxmd.com/read/28436340/racial-inequality-in-the-annual-risk-of-tuberculosis-infection-in-the-united-states-1910-1933
#1
J L Zelner, C Muller, J J Feigenbaum
Tuberculosis (TB) mortality rates in the USA fell rapidly from 1910 to 1933. However, during this period, racial disparities in TB mortality in the nation's expanding cities grew. Because of long delays between infection and disease, TB mortality is a poor indicator of short-term changes in transmission. We estimated the annual risk of TB infection (ARTI) in 11 large US cities to understand whether rising inequality in mortality reflected rising inequality in ARTI using city-level TB mortality data compiled by the US Department of Commerce from 1910 to 1933...
April 24, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28434972/one-bacillus-to-rule-them-all-investigating-broad-range-host-adaptation-in-mycobacterium-bovis
#2
REVIEW
Adrian R Allen
Recent advances are permitting researchers to undertake largescale comparative genomics studies within and between bacterial species to determine the types of genetic change that underpin the phenotypic spectrum that runs from strict host adaptation to generalist. Within the Mycobacterium tuberculosis complex (MTBC) of bacilli, there is much heterogeneity in host specificity. Globally, Mycobacterium bovis exhibits a broad host range encompassing domesticated bovine and wildlife animals unlike the human adapted specialist M...
April 20, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28427367/determinants-of-delayed-care-seeking-for-tb-suggestive-symptoms-in-seru-district-oromiya-region-ethiopia-a-community-based-unmatched-case-control-study
#3
Robel Yirgu, Firaol Lemessa, Selamawit Hirpa, Abraham Alemayehu, Eveline Klinkenberg
BACKGROUND: Early tuberculosis (TB) case finding and adequate chemotherapy are essential for interrupting disease transmission and preventing complications due to delayed care seeking. This study was undertaken in order to provide insights into the magnitude and determinants of patient delay. METHODS: The study was conducted in rural Seru district, employing a population based unmatched case-control study design. The WHO standardized TB screening tool was used to identify presumptive TB cases among the district population ages > 15 years...
April 20, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28426114/infectious-diseases-and-migrant-worker-health-in-singapore-a-receiving-country-s-perspective
#4
Sapna P Sadarangani, Poh Lian Lim, Shawn Vasoo
Background.: Approximately 1.4 million migrant workers reside in Singapore, presenting unique infectious disease challenges to both migrants and Singapore. Methods.: A Pubmed, MEDLINE (Ovid), EBSCO Host (Global Health) and Google Scholar search was performed for both peer, non-peer reviewed articles and reports relevant to migrant health in Singapore, published between 1 January 1989 and 1 September 2016. Additional studies were identified from citations within searched articles...
July 1, 2017: Journal of Travel Medicine
https://www.readbyqxmd.com/read/28419514/activition-of-tlr7-inhibition-of-mycobacterium-tuberculosis-survival-by-autophagy-in-raw-264-7-macrophages
#5
Meng Bao, Zhengjun Yi, Yurong Fu
The aim of the study was to evaluate the effect of regulation of TLR7 on Mycobacterium tuberculosis (Mtb) survival in macrophages. TLR7 expression in macrophages infected by Mtb was detected by RT-PCR and western blotting. Regulation of TLR7 was achieved by single strand RNA (ssRNA) or siRNA. The effects of TLR7 on Mtb survival and cell viability were detected by acid fast staining and cell counting kit-8, respectively. Cell ultrastructure was observed via transmission electron microscopy (TEM), and autophagy related protein LC3 was analyzed by western blotting...
April 17, 2017: Journal of Cellular Biochemistry
https://www.readbyqxmd.com/read/28419200/switching-to-efavirenz-versus-remaining-on-ritonavir-boosted-lopinavir-in-hiv-infected-children-exposed-to-nevirapine-long-term-outcomes-of-a-randomized-trial
#6
Pamela M Murnane, Renate Strehlau, Stephanie Shiau, Faeezah Patel, Ndileke Mbete, Gillian Hunt, Elaine J Abrams, Ashraf Coovadia, Louise Kuhn
Background: We previously demonstrated the non-inferiority of switching to efavirenz (EFV) versus remaining on ritonavir-boosted lopinavir (LPV/r) for virologic control in HIV-infected children exposed to nevirapine (NVP) for prevention of mother-to-child transmission. Here we assess outcomes up to four years post-randomization. Methods: From 2010-2013, 298 NVP-exposed HIV-infected children ≥3 years of age were randomized to switch to EFV or remain on LPV/r in Johannesburg, South Africa (Clinicaltrials...
April 17, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28417858/-18-f-fdg-pet-ct-imaging-of-thoracic-and-extrathoracic-tuberculosis-in-children
#7
REVIEW
Matthieu Pelletier-Galarneau, Patrick Martineau, Lionel S Zuckier, Xuan Pham, Raymond Lambert, Sophie Turpin
Tuberculosis (TB) remains a major health problem, affecting approximately one-third of the world׳s population. The tubercle bacillus can affect virtually any organ of the human body and if left untreated can lead to severe morbidity and death. Diagnosis of active TB is challenging, especially in children. As a "great imitator," the disease can mimic numerous other pathologies, both clinically and at imaging. Although recognition of active TB is crucial to initiate adequate treatment in a timely fashion, thereby preventing transmission of disease, differentiation of active and quiescent disease is not always straightforward...
May 2017: Seminars in Nuclear Medicine
https://www.readbyqxmd.com/read/28405623/bcg-vaccination-induces-hiv-target-cell-activation-in-hiv-exposed-infants-in-a-randomized-trial
#8
Melanie A Gasper, Anneke C Hesseling, Isaac Mohar, Landon Myer, Tali Azenkot, Jo-Ann S Passmore, Willem Hanekom, Mark F Cotton, I Nicholas Crispe, Donald L Sodora, Heather B Jaspan
BACKGROUND. Bacillus Calmette-Guérin (BCG) vaccine is administered at birth to protect infants against tuberculosis throughout Africa, where most perinatal HIV-1 transmission occurs. We examined whether BCG vaccination alters the levels of activated HIV target T cells in HIV-exposed South African infants. METHODS. HIV-exposed infants were randomized to receive routine (at birth) or delayed (at 8 weeks) BCG vaccination. Activated and CCR5-expressing peripheral blood CD4(+) T cell, monocyte, and NK cell frequencies were evaluated by flow cytometry and immune gene expression via PCR using Biomark (Fluidigm)...
April 6, 2017: JCI Insight
https://www.readbyqxmd.com/read/28403060/the-risk-of-mycobacterium-tuberculosis-transmission-from-pediatric-index-cases-to-school-pupils
#9
Paola Piccini, Elisabetta Venturini, Leila Bianchi, Simonetta Baretti, Paolo Filidei, Luana Paliaga, Franca Mazzoli, Elena Chiappini, Maurizio de Martino, Luisa Galli
This study is the largest report on Mycobacterium tuberculosis transmission rate (TR) from children with pulmonary tuberculosis to school pupils. Higher TR (around 21.6%) was observed in contacts of smear-positive children. TR from pediatric smear-negative index cases was around 0. If our data are confirmed, school contacts of a smear-negative index case could be screened only by clinical evaluation and tuberculin skin test, avoiding the routine use of chest radiographs in children less than 5 years of age as well...
May 2017: Pediatric Infectious Disease Journal
https://www.readbyqxmd.com/read/28399968/tuberculosis-resistance-conferring-mutations-with-fitness-cost-among-hiv-positive-individuals-in-uganda
#10
W Ssengooba, D Lukoye, C J Meehan, D P Kateete, M L Joloba, B C de Jong, F G Cobelens, F van Leth
BACKGROUND: Multidrug-resistant tuberculosis (MDR-TB) is considered to be less transmissible due to the fitness cost associated with drug resistance-conferring mutations in essential genes. OBJECTIVE: To test the hypothesis that TB drug resistance-conferring mutations with fitness cost are more frequent among human immunodeficiency virus (HIV) positive than among HIV-negative patients. DESIGN: We analysed all strains from the two TB drug resistance surveys conducted in Uganda between 2008 and 2011...
May 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28399965/impact-of-euro-american-sublineages-of-mycobacterium-tuberculosis-on-new-infections-among-named-contacts
#11
J-Y Feng, L G Jarlsberg, J Rose, J A Grinsdale, M Janes, J Higashi, D H Osmond, P Nahid, P C Hopewell, M Kato-Maeda
BACKGROUND: The impact of demographic, clinical, and bacterial factors on new infection by Euro-American lineage Mycobacterium tuberculosis among contacts of patients with tuberculosis (TB) has not been evaluated. OBJECTIVE: To describe the risk factors for new infection by Euro-American M. tuberculosis sublineages in San Francisco, California. DESIGN: We included contacts of patients with TB due to Euro-American M. tuberculosis. Sublineages were determined by large-sequence polymorphisms...
May 1, 2017: International Journal of Tuberculosis and Lung Disease
https://www.readbyqxmd.com/read/28399800/tst-positivity-in-household-contacts-of-tuberculosis-patients-a-case-contact-study-in-malawi
#12
Jonas Hector, Suzanne T Anderson, Gertrude Banda, Mercy Kamdolozi, Laura F Jefferys, Doris Shani, Natalie J Garton, Agnes Mwale, Annie Jobe, Geraint R Davies, Derek J Sloan
BACKGROUND: Screening household contacts of active tuberculosis (TB) patients is recommended for TB control. Due to resource constraints this rarely occurs in lower income countries. Demographic and clinical features of index cases may influence the likelihood of onwards TB transmission. It has also been proposed that accumulation of intracellular lipid bodies within M. tuberculosis cells may also enhance bacterial transmissibility. This study explored whether clinical and bacteriological observations recorded at baseline in TB cases in Malawi could help identify those with the highest risk of onwards transmission, to prioritise contact tracing...
April 11, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28396540/rifabutin-is-active-against-mycobacterium-abscessus-complex
#13
Dinah Binte Aziz, Jian Liang Low, Mu-Lu Wu, Martin Gengenbacher, Jeanette W P Teo, Véronique Dartois, Thomas Dick
Lung infections with Mycobacterium abscessus are emerging as a global threat to individuals with cystic fibrosis and other patient groups. Recent evidence for human-to-human transmission worsens the situation. M. abscessus is an intrinsically multidrug resistant pathogen showing resistance even against standard anti tuberculosis drugs such as rifampicin. Here, our objective was to identify existing drugs that may be employed for the treatment of M. abscessus lung disease. A collection of more than 2700 approved drugs was screened at a single point concentration against an M...
April 10, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28394899/genomic-analyses-of-the-ancestral-manila-family-of-mycobacterium-tuberculosis
#14
Xuehua Wan, Kent Koster, Lishi Qian, Edward Desmond, Richard Brostrom, Shaobin Hou, James T Douglas
With its airborne transmission and prolonged latency period, Mycobacterium tuberculosis spreads worldwide as one of the most successful bacterial pathogens and continues to kill millions of people every year. M. tuberculosis lineage 1 is inferred to originate ancestrally based on the presence of the 52-bp TbD1 sequence and analysis of single nucleotide polymorphisms. Previously, we briefly reported the complete genome sequencing of M. tuberculosis strains 96121 and 96075, which belong to the ancient Manila family and modern Beijing family respectively...
2017: PloS One
https://www.readbyqxmd.com/read/28386470/determining-the-risk-of-intra-community-transmission-of-tuberculosis-in-the-northwest-of-iran-through-15-loci-miru-vntr-typing
#15
Ali Afaghi-Gharamaleki, Seyyedreza Moaddab, Mojtaba Darbouy, Khalil Ansarin, Shahram Hanifian
This study was carried out in order to investigating the effect of travelling on the transmission of tuberculosis from high- to low-burden TB countries. Mycobacteria samples isolated from patients of distinct and relatively co-related countries (Azerbaijan Republic and Tabriz [located in the northwest of Iran]) were analyzed through 15 loci MIRU-VNTR typing method. PCR was done using special primers for each of the loci; then the number of allele repeats for all loci were determined by the size of their fragments...
March 2017: European Journal of Microbiology & Immunology
https://www.readbyqxmd.com/read/28380276/microscopic-observation-drug-susceptibility-assay-vs-xpert-%C3%A2-mtb-rif-for-the-diagnosis-of-tuberculosis-in-a-rural-african-setting-a-cost-utility-analysis
#16
Philip Erick Wikman-Jorgensen, Jara Llenas-García, Tomàs María Pérez-Porcuna, Michael Hobbins, Jochen Ehmer, Manuel Aly Mussa, Carlos Ascaso
OBJECTIVE: To compare the cost-utility of Microscopic Observation Drug-Susceptibility Assay (MODS) and Xpert(®) MTB/RIF implementation for TB diagnosis in rural northern Mozambique. METHODS: Stochastic transmission compartmental TB model from the health care provider perspective with parameter input from direct measurements, systematic literature reviews, and expert opinion. MODS and Xpert(®) MTB/RIF were evaluated as replacement test of smear microscopy (SM) or as an add-on test after a negative SM...
April 5, 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/28377757/mycobacterial-cultures-contain-cell-size-and-density-specific-sub-populations-of-cells-with-significant-differential-susceptibility-to-antibiotics-oxidative-and-nitrite-stress
#17
Srinivasan Vijay, Rashmi Ravindran Nair, Deepti Sharan, Kishor Jakkala, Nagaraja Mukkayyan, Sharmada Swaminath, Atul Pradhan, Niranjan V Joshi, Parthasarathi Ajitkumar
The present study shows the existence of two specific sub-populations of Mycobacterium smegmatis and Mycobacterium tuberculosis cells differing in size and density, in the mid-log phase (MLP) cultures, with significant differential susceptibility to antibiotic, oxidative, and nitrite stress. One of these sub-populations (~10% of the total population), contained short-sized cells (SCs) generated through highly-deviated asymmetric cell division (ACD) of normal/long-sized mother cells and symmetric cell divisions (SCD) of short-sized mother cells...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28377319/development-of-extended-voyaging-anti-oxidant-linked-amphiphilic-polymeric-nanomicelles-for-anti-tuberculosis-drug-delivery
#18
Rajendran Amarnath Praphakar, Murugan A Munusamy, Mariappan Rajan
Amphiphilic chitosan-graft-poly(caprolactone)/(ferulic acid) (CS-g-PCL/FA) multi-co-polymers were fabricated by microwave-assisted ring opening polymerization followed by an 1-ethyl-3-(3-dimethyl-aminopropyl) carbodiimide (EDC)-mediated coupling reaction and characterized by Fourier transformed infrared (FTIR) spectroscopy. Graft copolymers self-assembled into nanomicelles, and were able to incorporate rifampicin (RF) into their hydrophobic inner cores. X-ray diffraction (XRD) patterns were applied to characterize the crystal structures of graft polymers and the effects of RF on micelle morphology...
April 2, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28375111/gender-and-occupation-wise-knowledge-awareness-and-prevention-of-tuberculosis-among-people-of-district-muzaffarabad-aj-k
#19
Atif Abbasi, Muhammad Rafique, Amir Saghir, Kamran Abbas, Shabnum Shaheen, Farooq Abdullah
To assess the awareness about the spread and control of tuberculosis as well as to investigate the gender and occupation wise differences among people regarding knowledge and attitude towards tuberculosis in the State of AJ & K. A cross-sectional descriptive study was conducted in district Muzaffarabad and a sample of 4000 respondents was selected by using stratified random sampling technique. The stratification was done with respect to gender and occupation. The occupation wise classification includes households, labors, and shop keepers, government employers, under graduate students of social and natural sciences, medical students and doctors...
November 2016: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28370491/extensions-to-bayesian-generalized-linear-mixed-effects-models-for-household-tuberculosis-transmission
#20
Avery I McIntosh, Gheorghe Doros, Edward C Jones-López, Mary Gaeddert, Helen E Jenkins, Patricia Marques-Rodrigues, Jerrold J Ellner, Reynaldo Dietze, Laura F White
Household contact studies, a mainstay of tuberculosis transmission research, often assume that tuberculosis-infected household contacts of an index case were infected within the household. However, strain genotyping has provided evidence against this assumption. Understanding the household versus community infection dynamic is essential for designing interventions. The misattribution of infection sources can also bias household transmission predictor estimates. We present a household-community transmission model that estimates the probability of community infection, that is, the probability that a household contact of an index case was actually infected from a source outside the home and simultaneously estimates transmission predictors...
March 29, 2017: Statistics in Medicine
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