keyword
MENU ▼
Read by QxMD icon Read
search

Legionella

keyword
https://www.readbyqxmd.com/read/28724206/vital-signs-health-care-associated-legionnaires-disease-surveillance-data-from-20-states-and-a-large-metropolitan-area-united-states-2015
#1
EDITORIAL
E A Soda, A E Barskey, P P Shah, S Schrag, C G Whitney, M J Arduino, S C Reddy, J M Kunz, C M Hunter, B H Raphael, L A Cooley
BACKGROUND: Legionnaires' disease, a severe pneumonia, is typically acquired through inhalation of aerosolized water containing Legionella bacteria. Legionella can grow in the complex water systems of buildings, including health care facilities. Effective water management programs could prevent the growth of Legionella in building water systems. METHODS: Using national surveillance data, Legionnaires' disease cases were characterized from the 21 jurisdictions (20 U...
August 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/28715056/evaluation-of-timing-of-re-appearance-of-vbnc-legionella-for-risk-assessment-in-hospital-water-distribution-systems
#2
L Marinelli, A Cottarelli, A G Solimini, A Del Cimmuto, M De Giusti
BACKGROUND: In this study we estimated the presence of Legionella species, viable but non-culturable (VBNC), in hospital water networks. We also evaluated the time and load of Legionella appearance in samples found negative using the standard culture method. METHODS: A total of 42 samples was obtained from the tap water of five hospital buildings. The samples were tested for Legionella by the standard culture method and were monitored for up to 12 months for the appearance of VBNC Legionella...
September 2017: Annali di Igiene: Medicina Preventiva e di Comunità
https://www.readbyqxmd.com/read/28714967/architecture-of-the-type-iv-coupling-protein-complex-of-legionella-pneumophila
#3
Mi-Jeong Kwak, J Dongun Kim, Hyunmin Kim, Cheolhee Kim, James W Bowman, Seonghoon Kim, Keehyoung Joo, Jooyoung Lee, Kyeong Sik Jin, Yeon-Gil Kim, Nam Ki Lee, Jae U Jung, Byung-Ha Oh
Many bacteria, including Legionella pneumophila, rely on the type IV secretion system to translocate a repertoire of effector proteins into the hosts for their survival and growth. Type IV coupling protein (T4CP) is a hexameric ATPase that links translocating substrates to the transenvelope secretion conduit. Yet, how a large number of effector proteins are selectively recruited and processed by T4CPs remains enigmatic. DotL, the T4CP of L. pneumophila, contains an ATPase domain and a C-terminal extension whose function is unknown...
July 17, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28713154/legionella-and-coxiella-effectors-strength-in-diversity-and-activity
#4
REVIEW
Jiazhang Qiu, Zhao-Qing Luo
Legionella pneumophila and Coxiella burnetii are two evolutionarily related intracellular pathogens that use the Dot/Icm type IV secretion system to translocate effectors into host cells. These effectors are essential for the establishment of membrane-bound compartments known as replication vacuoles, which enable the survival and replication of bacteria inside host cells. The effectors interfere with diverse signalling pathways to co-opt host processes, such as vesicle trafficking, ubiquitylation, gene expression and lipid metabolism, to promote pathogen survival...
July 17, 2017: Nature Reviews. Microbiology
https://www.readbyqxmd.com/read/28710211/occupational-risk-for-legionella-infection-among-dental-healthcare-workers-meta-analysis-in-occupational-epidemiology
#5
Stefano Petti, Matteo Vitali
OBJECTIVE: The occupational risk for Legionella infection among dental healthcare workers (DHCWs) is conjectured because of the risk of routine inhalation of potentially contaminated aerosols produced by the dental instruments. Nevertheless, occupational epidemiology studies are contrasting. This meta-analysis assessed the level of scientific evidence regarding the relative occupational risk for Legionella infection among DHCWs. METHODS: Literature search was performed without time and language restrictions, using broad data banks (PubMed, Scopus, Web of Science, GOOGLE Scholar) and generic keywords ('legionella' AND 'dent*')...
July 13, 2017: BMJ Open
https://www.readbyqxmd.com/read/28706879/multiple-substrate-usage-of-coxiella-burnetii-to-feed-a-bipartite-metabolic-network
#6
Ina Häuslein, Franck Cantet, Sarah Reschke, Fan Chen, Matteo Bonazzi, Wolfgang Eisenreich
The human pathogen Coxiella burnetii causes Q-fever and is classified as a category B bio-weapon. Exploiting the development of the axenic growth medium ACCM-2, we have now used (13)C-labeling experiments and isotopolog profiling to investigate the highly diverse metabolic network of C. burnetii. To this aim, C. burnetii RSA 439 NMII was cultured in ACCM-2 containing 5 mM of either [U-(13)C3]serine, [U-(13)C6]glucose, or [U-(13)C3]glycerol until the late-logarithmic phase. GC/MS-based isotopolog profiling of protein-derived amino acids, methanol-soluble polar metabolites, fatty acids, and cell wall components (e...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28698607/divergent-evolution-of-di-lysine-er-retention-vs-farnesylation-motif-mediated-anchoring-of-the-ankb-virulence-effector-to-the-legionella-containing-vacuolar-membrane
#7
John D Perpich, Awdhesh Kalia, Christopher T D Price, Snake C Jones, Kathy Wong, Kalle Gehring, Yousef Abu Kwaik
Within macrophages and amoeba, the Legionella-containing vacuole (LCV) membrane is derived from the ER. The bona fide F-box AnkB effector protein of L. pneumophila strain AA100/130b is anchored to the cytosolic side of the LCV membrane through host-mediated farnesylation of its C-terminal eukaryotic "CaaX" motif. Here we show that the AnkB homologue of the Paris strain has a frame shift mutation that led to a loss of the CaaX motif and a concurrent generation of a unique C-terminal KNKYAP motif, which resembles the eukaryotic di-lysine ER-retention motif (KxKxx)...
July 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28696299/polar-delivery-of-legionella-type-iv-secretion-system-substrates-is-essential-for-virulence
#8
Kwangcheol C Jeong, Debnath Ghosal, Yi-Wei Chang, Grant J Jensen, Joseph P Vogel
A recurrent emerging theme is the targeting of proteins to subcellular microdomains within bacterial cells, particularly to the poles. In most cases, it has been assumed that this localization is critical to the protein's function. Legionella pneumophila uses a type IVB secretion system (T4BSS) to export a large number of protein substrates into the cytoplasm of host cells. Here we show that the Legionella export apparatus is localized to the bacterial poles, as is consistent with many T4SS substrates being retained on the phagosomal membrane adjacent to the poles of the bacterium...
July 10, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28696077/legionnaires-disease-in-transplant-recipients-a-15-year-retrospective-study-in-a-tertiary-referral-center
#9
Shobini Sivagnanam, Sara Podczervinski, Susan M Butler-Wu, Vivian Hawkins, Zach Stednick, Lois A Helbert, William A Glover, Estella Whimbey, Jeffrey Duchin, Guang-Shing Cheng, Steven A Pergam
Legionnaires' disease (LD) can be fatal among high-risk transplant recipients. To understand the epidemiology of LD, we reviewed 15-year, longitudinal data from a center in Seattle, Washington that cares for both solid organ transplant (SOT) and hematopoietic cell transplant (HCT) recipients. We identified all laboratory-confirmed LD and extracted data on species, diagnostic modalities, clinical presentation, management, and outcomes from medical records. Among 32 patients with LD, transplant recipients made up the majority of diagnoses (22, 69%; SOT 10, HCT 12)...
July 11, 2017: Transplant Infectious Disease: An Official Journal of the Transplantation Society
https://www.readbyqxmd.com/read/28695408/a-gyrb-oligonucleotide-microarray-for-the-specific-detection-of-pathogenic-legionella-and-three-legionella-pneumophila-subsp
#10
Daoyi Xi, Yan Dou, Wei Ren, Shuang Yang, Lu Feng, Boyang Cao, Lei Wang
Among the 50 species and 70 serogroups of Legionella identified, Legionella pneumophila, comprising three subsp. (subsp. pneumophila, subsp. fraseri, and subsp. pasculleii), is recognized as the major cause of epidemic legionellosis. Rapid and reliable assays to identify pathogenic Legionella spp., and the three L. pneumophila subsp. in particular, are in great demand. In this study, we analyzed the gyrB genes of eleven Legionella spp. and subsp., comprising L. anisa, L. bozemanii, L. dumoffii, L. feeleii, L...
July 10, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28690882/photoinactivation-of-legionella-rubrilucens-by-visible-light
#11
J Schmid, K Hoenes, M Rath, P Vatter, B Spellerberg, M Hessling
In this study, the photoinactivation of Legionella by visible light is investigated. The success of this approach would offer new prospects for technical water disinfection and maybe even for therapeutic measures in cases of Legionella infections. Therefore, Legionella rubrilucens was dispensed on buffered charcoal yeast extract medium agar plates and illuminated with different doses of violet light generated by 405 nm light-emitting diodes (LEDs). A strong photoinactivation effect was observed. A dose of 125 J/ cm(2) reduced the bacterial concentration by more than 5 orders of magnitude compared to Legionella on unirradiated agar plates...
June 2017: European Journal of Microbiology & Immunology
https://www.readbyqxmd.com/read/28689128/incubation-of-premise-plumbing-water-samples-on-buffered-charcoal-yeast-extract-agar-at-elevated-temperature-and-ph-selects-for-legionella-pneumophila
#12
Harm R Veenendaal, Anke J Brouwer-Hanzens, Dick van der Kooij
Worldwide, over 90% of the notified cases of Legionnaires' disease are caused by Legionella pneumophila. However, the standard culture medium for the detection of Legionella in environmental water samples, Buffered Charcoal Yeast Extract (BCYE) agar of pH 6.9 ± 0.4 with or without antimicrobial agents incubated at 36 ± 1 °C, supports the growth of a large diversity of Legionella species. BCYE agar of elevated pH or/and incubation at elevated temperature gave strongly reduced recoveries of most of 26 L...
June 27, 2017: Water Research
https://www.readbyqxmd.com/read/28682593/selective-and-high-dynamic-range-assay-format-for-multiplex-detection-of-pathogenic-pseudomonas-aeruginosa-salmonella-typhimurium-and-legionella-pneumophila-rnas-using-surface-plasmon-resonance-imaging
#13
F Melaine, M Saad, S Faucher, M Tabrizian
Due to its well-characterized and highly conserved structure, as well as its relative abundance in metabolically active cells, bacterial 16S rRNA sequence plays an important role in microbial identification. In this work, a biosensing strategy has been developed for simultaneous detection of 16S rRNA analytes of three pathogenic bacterial strains: Legionella pneumophila, Pseudomonas aeruginosa, and Salmonella typhimurium. Surface plasmon resonance imaging (SPRi) was used as a detection technique coupled with DNA probe sandwich assemblies and gold nanoparticles (GNPs) for signal amplification...
July 6, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28675852/experimental-determination-of-drift-and-pm10-cooling-tower-emissions-influence-of-components-and-operating-conditions
#14
J Ruiz, A S Kaiser, M Lucas
Cooling tower emissions have become an increasingly common hazard to the environment (air polluting, ice formation and salts deposition) and to the health (Legionella disease) in the last decades. Several environmental policies have emerged in recent years limiting cooling tower emissions but they have not prevented an increasing intensity of outbreaks. Since the level of emissions depends mainly on cooling tower component design and the operating conditions, this paper deals with an experimental investigation of the amount of emissions, drift and PM10, emitted by a cooling tower with different configurations (drift eliminators and distribution systems) and working under several operating conditions...
July 1, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/28674380/exceptionally-high-creatine-kinase-ck-levels-in-multicausal-and-complicated-rhabdomyolysis-a-case-report
#15
Pavan Luckoor, Mashal Salehi, Afua Kunadu
BACKGROUND Rhabdomyolysis is a syndrome caused by muscle breakdown. It can be caused by traumatic as well as non-traumatic factors such as drugs, toxins, and infections. Although it has been initially associated with only traumatic causes, non-traumatic causes now appear to be at least 5 times more frequent. In rhabdomyolysis, the CK levels can range anywhere from 10 000 to 200 000 or even higher. The higher the CK levels, the greater will be the renal damage and associated complications. We present the case of a patient with exceptionally massive rhabdomyolysis with unusually high CK levels (nearly 1 million) caused by combined etiologic factors and complicated with acute renal failure...
July 4, 2017: American Journal of Case Reports
https://www.readbyqxmd.com/read/28674246/intracellular-growth-and-morphological-characteristics-of-legionella-pneumophila-during-invasion-and-proliferation-in-different-cells
#16
Lina Xiong, Shinji Yamasaki, Hongsheng Chen, Lei Shi, Ziyao Mo
Various studies have been made to attempt to study the interaction between Legionella pneumophila and the host cells. In this research, we successfully constructed a L. pneumophila mutant strain that stably expressed high levels of green fluorescent protein and used this strain to evaluate the adherence, invasion and proliferation of L. pneumophila in association with several cell lines, including seven cell lines [human macrophage-like cell lines (U937, THP-1), murine macrophage-like cell lines (J774.1A, Raw264...
2017: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/28674045/digital-pcr-for-detection-and-quantification-of-fluoroquinolone-resistance-in-legionella-pneumophila
#17
Aurélie Hennebique, Marie Bidart, Sophie Jarraud, Laëtitia Beraud, Carole Schwebel, Max Maurin, Sandrine Boisset
The emergence of fluoroquinolone (FQ)-resistant mutants of Legionella pneumophila in infected humans has been previously reported using a next-generation DNA sequencing (NGS) approach. This finding could explain part of the therapeutic failures observed in legionellosis patients treated with these antibiotics. The aim of this study was to develop digital PCR (dPCR) assays allowing rapid and accurate detection and quantification of these resistant mutants in respiratory samples, especially when the proportion of mutants in a wild-type background is low...
July 3, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28668570/changes-in-pathogens-and-pneumococcal-serotypes-causing-community-acquired-pneumonia-in-the-netherlands
#18
Stefan M T Vestjens, Gertjan H J Wagenvoort, Jan C Grutters, Bob Meek, Arnoud F Aldenkamp, Bart J M Vlaminckx, Willem-Jan W Bos, Ger T Rijkers, Ewoudt M W van de Garde
BACKGROUND: In 2006 a 7-valent pneumococcal conjugate vaccine (PCV7) was introduced in the immunisation programme for infants in The Netherlands and replaced by PCV10 in 2011. Limited data exist about the impact of PCV on the aetiology of CAP as a whole. The aim of the present study is to describe the overall changes in microbial aetiology, pneumococcal burden (including non-bacteraemic pneumococcal pneumonia) and its serotypes in adult community-acquired pneumonia (CAP) after the introduction of these PCVs...
June 28, 2017: Vaccine
https://www.readbyqxmd.com/read/28668392/a-novel-conformation-of-the-lc3-interacting-region-motif-revealed-by-the-structure-of-a-complex-between-lc3b-and-ravz
#19
Do Hoon Kwon, Leehyeon Kim, Byeong-Won Kim, Jun Hoe Kim, Kyung-Hye Roh, Eui-Ju Choi, Hyun Kyu Song
LC3-family member proteins play a critical role in autophagy, a cellular process responsible for the degradation of massive cellular components including intracellular pathogens. A variety of molecules involved in the autophagic pathway engage in specific interactions with a unique sequence motif referred to as the LIR (LC3-interacting region) motif. Although identification of conserved structural features of LIR motifs in complex with LC3-family members has established a canonical LIR motif, atypical conformations of LIR motifs have recently been revealed...
June 28, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28667632/monitoring-effector-translocation-using-the-tem-1-beta-lactamase-reporter-system
#20
Julie Allombert, Anne Vianney, Xavier Charpentier
Among the bacterial secretion systems, the Type III, IV, and VI secretion systems enable bacteria to secrete proteins directly into a target cell. This specific form of secretion, referred to as translocation, is essential for a number of pathogens to alter or kill targeted cells. The translocated proteins, called effector proteins, can directly interfere with the normal processes of the targeted cells, preventing elimination of pathogens and promoting their multiplication. The function of effector proteins varies greatly depending on the considered pathogen and the targeted cell...
2017: Methods in Molecular Biology
keyword
keyword
21124
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"