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Legionnaires disease

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https://www.readbyqxmd.com/read/28634242/type-ii-secretion-substrates-of-legionella-pneumophila-translocate-out-of-the-pathogen-occupied-vacuole-via-a-semipermeable-membrane
#1
Hilary K Truchan, Harry D Christman, Richard C White, Nakisha S Rutledge, Nicholas P Cianciotto
Legionella pneumophila replicates in macrophages in a host-derived phagosome, termed the Legionella-containing vacuole (LCV). While the translocation of type IV secretion (T4S) effectors into the macrophage cytosol is well established, the location of type II secretion (T2S) substrates in the infected host cell is unknown. Here, we show that the T2S substrate ProA, a metalloprotease, translocates into the cytosol of human macrophages, where it associates with the LCV membrane (LCVM). Translocation is detected as early as 10 h postinoculation (p...
June 20, 2017: MBio
https://www.readbyqxmd.com/read/28628460/risk-factors-for-legionella-longbeachae-legionnaires-disease-new-zealand
#2
Emma Kenagy, Patricia C Priest, Claire M Cameron, Debbie Smith, Pippa Scott, Vicki Cho, Peter Mitchell, David R Murdoch
Legionella longbeachae, found in soil and compost-derived products, is a globally underdiagnosed cause of Legionnaires' disease. We conducted a case-control study of L. longbeachae Legionnaires' disease in Canterbury, New Zealand. Case-patients were persons hospitalized with L. longbeachae pneumonia, and controls were persons randomly sampled from the electoral roll for the area served by the participating hospital. Among 31 cases and 172 controls, risk factors for Legionnaires' disease were chronic obstructive pulmonary disease, history of smoking >10 years, and exposure to compost or potting mix...
July 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28625225/legionella-longbeachae-detected-in-an-industrial-cooling-tower-linked-to-a-legionellosis-outbreak-new-zealand-2015-possible-waterborne-transmission
#3
C N Thornley, D J Harte, R P Weir, L J Allen, K J Knightbridge, P R T Wood
A legionellosis outbreak at an industrial site was investigated to identify and control the source. Cases were identified from disease notifications, workplace illness records, and from clinicians. Cases were interviewed for symptoms and risk factors and tested for legionellosis. Implicated environmental sources were sampled and tested for legionella. We identified six cases with Legionnaires' disease and seven with Pontiac fever; all had been exposed to aerosols from the cooling towers on the site. Nine cases had evidence of infection with either Legionella pneumophila serogroup (sg) 1 or Legionella longbeachae sg1; these organisms were also isolated from the cooling towers...
June 19, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28622979/whole-genome-sequencing-for-identification-of-the-source-in-hospital-acquired-legionnaires-disease
#4
A M Rosendahl Madsen, A Holm, T G Jensen, E Knudsen, H Lundgaard, M N Skov, S A Uldum, M Kemp
Acquisition of Legionnaires' disease is a serious complication of hospitalization. Rapid determination of whether or not the infection is caused by strains of Legionella pneumophila in the hospital environment is crucial to avoid further cases. This study investigated the use of whole-genome sequencing to identify the source of infection in hospital-acquired Legionnaires' disease. Phylogenetic analyses showed close relatedness between one patient isolate and a strain found in hospital water, confirming suspicion of nosocomial infection...
April 27, 2017: Journal of Hospital Infection
https://www.readbyqxmd.com/read/28619815/complete-genome-sequence-of-a-legionella-longbeachae-serogroup-1-strain-isolated-from-a-patient-with-legionnaires-disease
#5
Sandy Slow, Trevor Anderson, James Miller, Siddharth Singh, David Murdoch, Patrick J Biggs
Legionella longbeachae serogroup 1, predominantly found in soil and composted plant material, causes the majority of cases of Legionnaires' disease (LD) in New Zealand. Here, we report the complete genome sequence of an L. longbeachae serogroup 1 (sg1) isolate derived from a patient hospitalized with LD in Christchurch, New Zealand.
June 15, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28615983/legionnaires-disease-clinicoradiological-comparison-of-sporadic-versus-outbreak-cases
#6
Hafiz Rizwan Talib Hashmi, Lakshmi Saladi, Frances Petersen, Misbahuddin Khaja, Gilda Diaz-Fuentes
BACKGROUND: In 2015, New York City experienced the worst outbreak of Legionnaires' disease in the history of the city. We compare patients seen during the 2015 outbreak with sporadic cases of Legionella during the past 5 years. METHODS: We conducted a retrospective chart review of 90 patients with Legionnaires' disease, including sporadic cases of Legionella infection admitted from 2010 to 2015 (n = 55) and cases admitted during the 2015 outbreak (n = 35). RESULTS: We saw no significant differences between the 2 groups regarding demographics, smoking habits, alcohol intake, underlying medical disease, or residence type...
2017: Clinical Medicine Insights. Circulatory, Respiratory and Pulmonary Medicine
https://www.readbyqxmd.com/read/28598348/mortality-from-selected-diseases-that-can-be-transmitted-by-water-united-states-2003-2009
#7
J W Gargano, E A Adam, S A Collier, K E Fullerton, S J Feinman, M J Beach
Diseases spread by water are caused by fecal-oral, contact, inhalation, or other routes, resulting in illnesses affecting multiple body systems. We selected 13 pathogens or syndromes implicated in waterborne disease outbreaks or other well-documented waterborne transmission (acute otitis externa, Campylobacter, Cryptosporidium, Escherichia coli (E. coli), free-living ameba, Giardia, Hepatitis A virus, Legionella (Legionnaires' disease), nontuberculous mycobacteria (NTM), Pseudomonas-related pneumonia or septicemia, Salmonella, Shigella, and Vibrio)...
June 2017: Journal of Water and Health
https://www.readbyqxmd.com/read/28596545/rapid-on-site-monitoring-of-legionella-pneumophila-in-cooling-tower-water-using-a-portable-microfluidic-system
#8
Nobuyasu Yamaguchi, Yusuke Tokunaga, Satoko Goto, Yudai Fujii, Fumiya Banno, Akiko Edagawa
Legionnaires' disease, predominantly caused by the bacterium Legionella pneumophila, has increased in prevalence worldwide. The most common mode of transmission of Legionella is inhalation of contaminated aerosols, such as those generated by cooling towers. Simple, rapid and accurate methods to enumerate L. pneumophila are required to prevent the spread of this organism. Here, we applied a microfluidic device for on-chip fluorescent staining and semi-automated counting of L. pneumophila in cooling tower water...
June 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28594788/vital-signs-health-care-associated-legionnaires-disease-surveillance-data-from-20-states-and-a-large-metropolitan-area-united-states-2015
#9
Elizabeth A Soda, Albert E Barskey, Priti P Shah, Stephanie Schrag, Cynthia G Whitney, Matthew J Arduino, Sujan C Reddy, Jasen M Kunz, Candis M Hunter, Brian H Raphael, Laura 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...
June 9, 2017: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/28594785/notes-from-the-field-two-cases-of-legionnaires-disease-in-newborns-after-water-births-arizona-2016
#10
Geoffrey Granseth, Rachana Bhattarai, Tammy Sylvester, Siru Prasai, Eugene Livar
No abstract text is available yet for this article.
June 9, 2017: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/28582852/human-anti-lipopolysaccharid-lps-antibodies-against-legionella-with-high-species-specificity
#11
Philipp Kuhn, Stefanie Thiem, Michael Steinert, Duncan Purvis, Veronika Lugmayr, Ulrich Treutlein, Lutz Plobner, Robert-Matthias Leiser, Michael Hust, Stefan Dübel
Legionella are Gram-negative bacteria that are ubiquitously present in natural and man-made water reservoirs. When humans inhale aerosolized water contaminated with Legionella, alveolar macrophages can be infected, which may lead to a life-threatening pneumonia called Legionnaires' disease. Due to the universal distribution of Legionella in water and their potential threat to human health, the Legionella concentration in water for human use must be strictly monitored, which is difficult since the standard detection still relies on lengthy cultivation and analysis of bacterial morphology...
May 8, 2017: Human Antibodies
https://www.readbyqxmd.com/read/28572318/complete-genome-sequences-of-two-geographically-distinct-legionella-micdadei-clinical-isolates
#12
Amy J Osborne, Bethany R Jose, Jasper Perry, Zoe Smeele, Jack Aitken, Paul P Gardner, Sandy Slow
Legionella is a highly diverse genus of intracellular bacterial pathogens that cause Legionnaire's disease (LD), an often severe form of pneumonia. Two L. micdadei sp. clinical isolates, obtained from patients hospitalized with LD from geographically distinct areas, were sequenced using PacBio SMRT cell technology, identifying incomplete phage regions, which may impact virulence.
June 1, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28570695/molecular-basis-for-the-binding-and-modulation-of-v-atpase-by-a-bacterial-effector-protein
#13
Jianhua Zhao, Ksenia Beyrakhova, Yao Liu, Claudia P Alvarez, Stephanie A Bueler, Li Xu, Caishuang Xu, Michal T Boniecki, Voula Kanelis, Zhao-Qing Luo, Miroslaw Cygler, John L Rubinstein
Intracellular pathogenic bacteria evade the immune response by replicating within host cells. Legionella pneumophila, the causative agent of Legionnaires' Disease, makes use of numerous effector proteins to construct a niche supportive of its replication within phagocytic cells. The L. pneumophila effector SidK was identified in a screen for proteins that reduce the activity of the proton pumping vacuolar-type ATPases (V-ATPases) when expressed in the yeast Saccharomyces cerevisae. SidK is secreted by L. pneumophila in the early stages of infection and by binding to and inhibiting the V-ATPase, SidK reduces phagosomal acidification and promotes survival of the bacterium inside macrophages...
June 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28497871/vital-signs-deficiencies-in-environmental-control-identified-in-outbreaks-of-legionnaires-disease-north-america-2000-2014
#14
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/28479105/early-radiographic-and-tomographic-manifestations-of-legionnaires-disease
#15
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
#16
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
#17
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
https://www.readbyqxmd.com/read/28463665/accuracy-of-diagnostic-tests-for-legionnaires-disease-a-systematic-review
#18
REVIEW
Elisabete Cristovam, Dejanira Almeida, Daniel Caldeira, Joaquim J Ferreira, Teresa Marques
PURPOSE: Rapid and effective diagnosis of Legionnaires' disease (LD) cases is extremely important so that timely and appropriate therapy can be provided, thereby lowering the morbidity and mortality rates and reducing the health and economic costs associated with this disease. METHODOLOGY: Diagnosis is established solely by microbiological tests. There are several methods available, each with different performance, sensitivity and specificity characteristics, and further understanding is required...
April 2017: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28441664/protection-against-legionnaire-s-disease-recombinant-flagellin-a-of-legionella-pneumophila-can-induce-protective-immunity-against-bacteremia-in-a-balb-c-murine-model
#19
Ashraf Mohabati Mobarez, Roya Ahmadrajabi, Nima Khoramabadi, Ali-Hatef Salmanian
To investigate the immunoprotective effects of the recombinant type A flagellin (FLA), the flaA gene of Legionella pneumophila serogroup 1 strain Paris was cloned into pET28a(+). Recombinant FLA (rFLA) was overexpressed in E. coli BL21 (DE3) and purified by Ni2+ exchange chromatography. Female BALB/c aged 6-8 weeks were immunized with 20 μg of rFLA. Nonimmunized mice along with mice inoculated with a sublethal dose of live L. pneumophila intravenously were considered as negative and positive controls, respectively...
2017: Journal of Molecular Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28403769/legionnaires-disease-cluster-investigation-in-sydney
#20
Marianne Dowsett, Emma Quinn, Leena Gupta
No abstract text is available yet for this article.
April 17, 2017: Medical Journal of Australia
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