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https://www.readbyqxmd.com/read/28531183/a-scoping-review-on-bio-aerosols-in-healthcare-and-the-dental-environment
#1
Charifa Zemouri, Hans de Soet, Wim Crielaard, Alexa Laheij
BACKGROUND: Bio-aerosols originate from different sources and their potentially pathogenic nature may form a hazard to healthcare workers and patients. So far no extensive review on existing evidence regarding bio-aerosols is available. OBJECTIVES: This study aimed to review evidence on bio-aerosols in healthcare and the dental setting. The objectives were 1) What are the sources that generate bio-aerosols?; 2) What is the microbial load and composition of bio-aerosols and how were they measured?; and 3) What is the hazard posed by pathogenic micro-organisms transported via the aerosol route of transmission? METHODS: Systematic scoping review design...
2017: PloS One
https://www.readbyqxmd.com/read/28530837/stereoselective-synthesis-of-the-equatorial-glycosides-of-legionaminic-acid
#2
Oskar Popik, Bibek Dhakal, David Crich
The synthesis of a legionaminic acid donor from N-acetyl neuraminic acid in fifteen steps and 19% overall yield is described. Activation of the adamantanyl thioglycoside in the donor with N-iodosuccinimide and trifluoromethanesulfonic anhydride in dichloromethane and acetonitrile at -78 degrees C in the presence of primary secondary and tertiary alcohols affords the corresponding glycosides in excellent yield and good to excellent equatorial selectivity. In particular coupling to the 4-OH of a suitably protected neuraminic acid derivative affords a disaccharide that closely resembles the glycosidic linikage in the polylegionaminic acid from the lipopolysaccharide of the Legionella pneumophila virulence factor...
May 22, 2017: Journal of Organic Chemistry
https://www.readbyqxmd.com/read/28529959/getting-inside-type-i-ifns-type-i-ifns-in-intracellular-bacterial-infections
#3
REVIEW
Deann T Snyder, Jodi F Hedges, Mark A Jutila
Type I interferons represent a unique and complex group of cytokines, serving many purposes during innate and adaptive immunity. Discovered in the context of viral infections, type I IFNs are now known to have myriad effects in infectious and autoimmune disease settings. Type I IFN signaling during bacterial infections is dependent on many factors including whether the infecting bacterium is intracellular or extracellular, as different signaling pathways are activated. As such, the repercussions of type I IFN induction can positively or negatively impact the disease outcome...
2017: Journal of Immunology Research
https://www.readbyqxmd.com/read/28529020/nosocomial-legionellosis-and-invasive-aspergillosis-in-a-child-with-t-lymphoblastic-leukemia
#4
Rhoikos Furtwängler, Uwe Schlotthauer, Barbara Gärtner, Norbert Graf, Arne Simon
Invasive aspergillosis of the lungs and the central nervous system and Legionella pneumophilia serotype 1 infection of the lungs were diagnosed in a 22-month old child during inpatient induction treatment for T-lymphoblastic leukemia. Environmental investigations i.e. samples from the hospital water system did not reveal any Legionella. The patient may have been exposed to waterborne pathogens despite terminal water filtration due to a technical device to release residual tap water from the hose after showering...
May 13, 2017: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/28527390/on-filter-direct-amplification-of-legionella-pneumophila-for-rapid-assessment-of-its-abundance-and-viability
#5
Farag A Samhan, Tiffany M Stedtfeld, Hassan Waseem, Maggie R Williams, Robert D Stedtfeld, Syed A Hashsham
Guidelines and regulations to control Legionella pneumophila in cooling water systems of large buildings are evolving due to the increasing number of outbreaks. Rapid, on-site, simple, and sensitive quantification methods that are also able to assess viability may be extremely useful in monitoring and control. Culture-based methods for measuring L. pneumophila may take 4-10 days and qPCR-based methods are also slow, requiring at least a day from sample to result, albeit mainly due to the need for sample transport to a centralized laboratory...
May 13, 2017: Water Research
https://www.readbyqxmd.com/read/28516796/legionella-spp-in-dental-unit-waterlines
#6
E Sedlata Juraskova, H Sedlackova, J Janska, O Holy, I Lalova, I Matouskova
OBJECTIVE: To determine the current presence of Legionella spp. in the output water of dental unit waterlines (DUWLs) and examine its mitigation by disinfection at the Institute of Dentistry and Oral Sciences, Faculty of Medicine and Dentistry, Palacky University Olomouc and University Hospital Olomouc. MATERIAL AND METHODS: The first stage of our survey involved collecting samples of DUWL output water from 50 dental chair units (DCUs), and 2 samples of the incoming potable water...
2017: Bratislavské Lekárske Listy
https://www.readbyqxmd.com/read/28515631/water-and-air-ozone-treatment-as-an-alternative-sanitizing-technology
#7
REVIEW
M Martinelli, F Giovannangeli, S Rotunno, C M Trombetta, E Montomoli
AIMS: We investigated the effectiveness of ozone (aqueous and gaseous) treatment as an alternative sanitizing technology to common conventional disinfectants in reducing the microbial contamination of both water and air. METHODS: Ozone was added for 20 minutes to a well-defined volume of water and air by the system named "Ozonomatic(®)". The effectiveness of ozonation was determined by counting CFU/ m3 or ml of bacteria present in samples of air or water collected before (T0) and after (T1) the addition of ozone and comparing the microbial load of different bacteria present in ozonized and nonozonized samples...
March 2017: Journal of Preventive Medicine and Hygiene
https://www.readbyqxmd.com/read/28513143/interactive-effects-of-corrosion-copper-and-chloramines-on-legionella-and-mycobacteria-in-hot-water-plumbing
#8
William J Rhoads, Amy Pruden, Marc A Edwards
Complexities associated with drinking water plumbing systems can result in undesirable interactions among plumbing components, undermining engineering controls for opportunistic pathogens (OPs). In this study, we examine the effects of plumbing system materials and two commonly applied disinfectants, copper and chloramines, on water chemistry and the growth of Legionella and mycobacteria across a transect of bench- and pilot-scale hot water experiments carried out with the same municipal water supply. We discovered that copper released from corrosion of plumbing materials can initiate evolution of >1,100 times more hydrogen (H2) from water heater sacrificial anode rods than does presence of copper dosed as soluble cupric ions...
May 17, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28504273/legionella-effector-lpg1137-shuts-down-er-mitochondria-communication-through-cleavage-of-syntaxin-17
#9
Kohei Arasaki, Yumi Mikami, Stephanie R Shames, Hiroki Inoue, Yuichi Wakana, Mitsuo Tagaya
During infection of macrophages, the pathogenic bacterium Legionella pneumophila secretes effector proteins that induce the conversion of the plasma membrane-derived vacuole into an endoplasmic reticulum (ER)-like replicative vacuole. These ER-like vacuoles are ultimately fused with the ER, where the pathogen replicates. Here we show that the L. pneumophila effector Lpg1137 is a serine protease that targets the mitochondria and their associated membranes. Lpg1137 binds to and cleaves syntaxin 17, a soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) protein that is known to participate in the regulation of mitochondrial dynamics through interaction with the mitochondrial fission factor Drp1 in fed cells and in autophagy through interaction with Atg14L and other SNAREs in starved cells...
May 15, 2017: Nature Communications
https://www.readbyqxmd.com/read/28502296/-recombinant-legionella-pneumophila-flagella-protein-a-rflaa-induces-the-secretion-of-il-6-and-il-1%C3%AE-in-raw264-7-cells-in-vitro
#10
Lijuan Jia, Xiuqin Cao, Zhiwei Yang
Objective To investigate the effect of recombinant Legionella pneumophila flagella protein A (rflaA) on the secretion of interleukin-6 (IL-6) and interleukin-1β (IL-1β) by RAW264.7 macrophage and the possible mechanism. Methods RAW264.7 cells were treated with 0.000, 0.125, 0.250, 0.500, 1.000, 2.000, 4.000 and 8.000 μg/mL rflaA to determine the EC50 of rflaA using CCK-8 assay. Secretion of IL-6 and IL-1β were measured by ELISA at 24, 36 and 48 hours after treatment of the cells with 0.04, 0.08 and 0.16 μg/mL rflaA...
May 2017: Xi Bao Yu Fen Zi Mian Yi Xue za Zhi, Chinese Journal of Cellular and Molecular Immunology
https://www.readbyqxmd.com/read/28501787/free-chlorine-and-monochloramine-inactivation-kinetics-of-aspergillus-and-penicillium-in-drinking-water
#11
Xiao Ma, Kyle Bibby
Fungi are near-ubiquitous in potable water distribution systems, but the disinfection kinetics of commonly identified fungi are poorly studied. In the present study, laboratory scale experiments were conducted to evaluate the inactivation kinetics of Aspergillus fumigatus, Aspergillus versicolor, and Penicillium purpurogenum by free chlorine and monochloramine. The observed inactivation data were then fit to a delayed Chick-Watson model. Based on the model parameter estimation, the Ct values (integrated product of disinfectant concentration C and contact time t over defined time intervals) for 99...
April 29, 2017: Water Research
https://www.readbyqxmd.com/read/28500949/human-health-risks-for-legionella-and-mycobacterium-avium-complex-mac-from-potable-and-non-potable-uses-of-roof-harvested-rainwater
#12
Kerry A Hamilton, Warish Ahmed, Simon Toze, Charles N Haas
A quantitative microbial risk assessment (QMRA) of opportunistic pathogens Legionella pneumophila (LP) and Mycobacterium avium complex (MAC) was undertaken for various uses of roof-harvested rainwater (RHRW) reported in Queensland, Australia to identify appropriate usages and guide risk management practices. Risks from inhalation of aerosols due to showering, swimming in pools topped up with RHRW, use of a garden hose, car washing, and toilet flushing with RHRW were considered for LP while both ingestion (drinking, produce consumption, and accidental ingestion from various activities) and inhalation risks were considered for MAC...
April 5, 2017: Water Research
https://www.readbyqxmd.com/read/28497871/vital-signs-deficiencies-in-environmental-control-identified-in-outbreaks-of-legionnaires-disease-north-america-2000-2014
#13
EDITORIAL
L E Garrison, J M Kunz, L A Cooley, M R Moore, C Lucas, S Schrag, J Sarisky, C G Whitney
BACKGROUND: The number of reported cases of Legionnaires' disease, a severe pneumonia caused by the bacterium Legionella, is increasing in the United States. During 2000-2014, the rate of reported legionellosis cases increased from 0.42 to 1.62 per 100 000 persons; 4% of reported cases were outbreak-associated. Legionella is transmitted through aerosolization of contaminated water. A new industry standard for prevention of Legionella growth and transmission in water systems in buildings was published in 2015...
October 2016: American Journal of Transplantation
https://www.readbyqxmd.com/read/28497808/a-unique-deubiquitinase-that-deconjugates-phosphoribosyl-linked-protein-ubiquitination
#14
Jiazhang Qiu, Kaiwen Yu, Xiaowen Fei, Yao Liu, Ernesto S Nakayasu, Paul D Piehowski, Jared B Shaw, Kedar Puvar, Chittaranjan Das, Xiaoyun Liu, Zhao-Qing Luo
Ubiquitination regulates many aspects of host immunity and thus is a common target for infectious agents. Recent studies have revealed that members of the SidE effector family of the bacterial pathogen Legionella pneumophila attack several small GTPases associated with the endoplasmic reticulum by a novel ubiquitination mechanism that does not require the E1 and E2 enzymes of the host ubiquitination machinery. In this case, ubiquitin is first activated by ADP-ribosylation at Arg42 by a mono-ADP-ribosyltransferase activity; the intermediate is then cleaved by a phosphodiesterase activity also residing within SdeA, concomitant with the attachment of ubiquitin to serine residues of substrate proteins via a phosphoribosyl linker...
May 12, 2017: Cell Research
https://www.readbyqxmd.com/read/28497596/development-of-immunochromatographic-colloidal-gold-test-strip-for-rapid-detection-of-haemophilus-influenzae-in-clinical-specimens
#15
MengMeng Kong, Bo Yang, ChunJie Gong, Hui Wang, Xin Li, Kesheng Zhao, Jiaji Li, Feng Wu, Xiao Liu, Zheng Hu
AIMS: A simple and fast test strip for simultaneous detection of Haemophilus influenzae, based on the theory of colloidal gold immunochromatography was developed. METHODS AND RESULTS: In this study, monodispersional colloidal gold and gold-labeled polyclonal antibody (AbP6Line) specific to the linear antigenic determinant OMP6 of H. influenzae were prepared, and identified by UV-Visible spectroscopy (200-700nm) and transmission electron microscopy (TEM). The test strip was assembled on a plastic backing containing a sample pad, a conjugate pad, an absorbent pad and a nitrocellulose membrane (NC), on which test and control lines were sticked...
May 12, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28494478/survival-of-legionella-in-earthquake-induced-soil-disturbance-liquefaction-in-residential-areas-christchurch-new-zealand-implications-for-disease
#16
Frances F Graham, David Jg Harte
AIM: To investigate a possible link between liquefaction dust exposure and the noticeable increase in legionellosis cases in response to major earthquakes in 2010 and 2011 that resulted in widespread soil disturbance (liquefaction) in parts of Christchurch, New Zealand. METHOD: We culture tested liquefaction-affected soil for Legionella spp. in the six months following the first earthquake in 2010. Thirty silt samples were collected randomly from locations within Christchurch's metropolitan area that were affected by liquefaction...
May 12, 2017: New Zealand Medical Journal
https://www.readbyqxmd.com/read/28480285/influence-of-antibiotics-on-the-detection-of-bacteria-by-culture-based-and-culture-independent-diagnostic-tests-in-patients-hospitalized-with-community-acquired-pneumonia
#17
Aaron M Harris, Anna M Bramley, Seema Jain, Sandra R Arnold, Krow Ampofo, Wesley H Self, Derek J Williams, Evan J Anderson, Carlos G Grijalva, Jonathan A McCullers, Andrew T Pavia, Richard G Wunderink, Kathryn M Edwards, Jonas M Winchell, Lauri A Hicks
BACKGROUND: Specimens collected after antibiotic exposure may reduce culture-based bacterial detections. The impact on culture-independent diagnostic tests is unclear. We assessed the effect of antibiotic exposure on both of these test results among patients hospitalized with community-acquired pneumonia (CAP). METHODS: Culture-based bacterial testing included blood cultures and high-quality sputum or endotracheal tube (ET) aspirates; culture-independent testing included urinary antigen testing (adults) for Streptococcus pneumoniae and Legionella pneumophila and polymerase chain reaction (PCR) on nasopharyngeal and oropharyngeal (NP/OP) swabs for Mycoplasma pneumoniae and Chlamydia pneumoniae...
2017: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/28479105/early-radiographic-and-tomographic-manifestations-of-legionnaires-disease
#18
Rémi Poirier, Jean Rodrigue, Jasmin Villeneuve, Yves Lacasse
PURPOSE: Legionnaires' disease (LD) may occur sporadically or in the course of outbreaks, where the typical radiological manifestations of the disease may better be delineated. We took advantage of a rare community-based epidemic of LD (181 patients) that occurred in 2012 in Quebec City, Canada, to describe the radiographic features of LD and compare the its tomographic presentation with that of community-acquired pneumonia caused by common bacteria other than Legionella pneumophila. METHODS: From the 181 individuals affected in the outbreak, we obtained the chest radiographs of 159 individuals (mean 63 ± 15 years of age) for detailed analysis; 33 patients had a computed tomography (CT) scan performed during the course of their illness...
May 4, 2017: Canadian Association of Radiologists Journal, Journal L'Association Canadienne des Radiologistes
https://www.readbyqxmd.com/read/28465870/is-legionellosis-present-and-important-in-colombia-an-analyses-of-cases-from-2009-to-2013
#19
Andrés Mauricio Patiño-Barbosa, Andrés Felipe Gil-Restrepo, Valentina Restrepo-Montoya, Wilmer E Villamil-Gomez, Jaime A Cardona-Ospina, Alfonso J Rodriguez-Morales
Infection due to Legionella pneumophila has been not studied in Colombia, although it is present. The observational, retrospective study in which the incidence of legionellosis in Colombia, 2009-2013, was estimated based on data extracted from the personal health records system (Registro Individual de Prestación de Servicios, RIPS) using the ICD-10 codes A48.1 (Legionnaires' disease) and A48.2 (Pontiac Fever). Using official population estimates of the National Administrative Department of Statistics (DANE), crude and adjusted incidence rates were estimated (cases / 100,000 pop)...
March 28, 2017: Curēus
https://www.readbyqxmd.com/read/28463986/the-legionella-pneumophila-gig-operon-responds-to-gold-and-copper-in-planktonic-and-biofilm-cultures
#20
Kathleen Jwanoswki, Christina Wells, Terri Bruce, Jennifer Rutt, Tabitha Banks, Tamara L McNealy
Legionella pneumophila contaminates man-made water systems and creates numerous exposure risks for Legionnaires' Disease. Because copper/silver ionization is commonly used to control L. pneumophila, its mechanisms of metal response and detoxification are of significant interest. Here we describe an L. pneumophila operon with significant similarity to the GIG operon of Cupriavidus metallidurans. The Legionella GIG operon is present in a subset of strains and has been acquired as part of the ICE-βox 65-kB integrative conjugative element...
2017: PloS One
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