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Legionnaires disease

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https://www.readbyqxmd.com/read/28098535/outbreak-of-legionnaire-s-disease-caused-by-legionella-pneumophila-serogroups-1-and-13
#1
Toshiro Kuroki, Junko Amemura-Maekawa, Hitomi Ohya, Ichiro Furukawa, Miyuki Suzuki, Tomoka Masaoka, Kastuhiro Aikawa, Kazumi Hibi, Masatomo Morita, Ken-Ichi Lee, Makoto Ohnishi, Fumiaki Kura
In Japan, hot springs and public baths are the major sources of legionellosis. In 2015, an outbreak of Legionnaires' disease occurred among 7 patients who had visited a spa house. Laboratory investigation indicated that L. pneumophila serogroup 1 and 13 strains caused the outbreak and that these strains were genetically related.
February 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28094205/legionnaires-disease-at-a-medical-center-in-southern-taiwan
#2
Tzu-Lun Hung, Ming-Chi Li, Li-Rong Wang, Ching-Chuan Liu, Chia-Wen Li, Po-Lin Chen, Ling-Shan Syue, Nan-Yao Lee, Wen-Chien Ko
BACKGROUND/PURPOSE: Legionella pneumophila had been recognized as a pathogen for both healthcare-associated and community-acquired pneumonia. We aimed to evaluate clinical features and outcomes of patients with Legionnaires' disease at a tertiary medical center in southern Taiwan. METHODS: From January 2005 to December 2013, a retrospective study of adult cases of Legionnaires' disease was conducted in a 1200-bed tertiary hospital. Their medical records were reviewed for further evaluation and analysis...
December 18, 2016: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28074027/a-unique-cis-encoded-small-noncoding-rna-is-regulating-legionella-pneumophila-hfq-expression-in-a-life-cycle-dependent-manner
#3
Giulia Oliva, Tobias Sahr, Monica Rolando, Maike Knoth, Carmen Buchrieser
: Legionella pneumophila is an environmental bacterium that parasitizes protozoa, but it may also infect humans, thereby causing a severe pneumonia called Legionnaires' disease. To cycle between the environment and a eukaryotic host, L. pneumophila is regulating the expression of virulence factors in a life cycle-dependent manner: replicating bacteria do not express virulence factors, whereas transmissive bacteria are highly motile and infective. Here we show that Hfq is an important regulator in this network...
January 10, 2017: MBio
https://www.readbyqxmd.com/read/28069647/ribosomal-mutations-conferring-macrolide-resistance-in-legionella-pneumophila
#4
Ghislaine Descours, Christophe Ginevra, Nathalie Jacotin, Françoise Forey, Joëlle Chastang, Elisabeth Kay, Jerome Etienne, Gérard Lina, Patricia Doublet, Sophie Jarraud
OBJECTIVES: Monitoring the emergence of antibiotic resistance is a recent issue in the treatment of Legionnaires' disease. Macrolides are recommended as first-line therapy but resistance mechanisms have not been studied in Legionella species. Our aim was to determine the molecular basis of macrolide resistance in L. pneumophila METHODS: Twelve independent lineages were propagated under erythromycin or azithromycin pressure towards a high-level macrolide resistance from a common susceptible L...
January 9, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28063015/innate-immunity-against-legionella-pneumophila-during-pulmonary-infections-in-mice
#5
REVIEW
Bonggoo Park, Gayoung Park, Jiyoung Kim, Seon Ah Lim, Kyung-Mi Lee
Legionella pneumophila is an etiological agent of the severe pneumonia known as Legionnaires' disease (LD). This gram-negative bacterium is thought to replicate naturally in various freshwater amoebae, but also replicates in human alveolar macrophages. Inside host cells, legionella induce the production of non-endosomal replicative phagosomes by injecting effector proteins into the cytosol. Innate immune responses are first line defenses against legionella during early phases of infection, and distinguish between legionella and host cells using germline-encoded pattern recognition receptors such as Toll-like receptors , NOD-like receptors, and RIG-I-like receptors, which sense pathogen-associated molecular patterns that are absent in host cells...
January 6, 2017: Archives of Pharmacal Research
https://www.readbyqxmd.com/read/28062459/biofilm-composition-and-threshold-concentration-for-growth-of-legionella-pneumophila-on-surfaces-exposed-to-flowing-warm-tap-water-without-disinfectant
#6
Dick van der Kooij, Geo L Bakker, Ronald Italiaander, Harm R Veenendaal, Bart A Wullings
: Legionella pneumophila in potable-water installations poses a potential health risk, but quantitative information about its replication in biofilms in relation to water quality is scarce. Therefore, biofilm formation on surfaces of glass and chlorinated polyvinyl chloride (CPVC) in contact with tap water at 34-39°C was investigated under controlled hydraulic conditions in a model system inoculated with biofilm-grown L. pneumophila The biofilm on glass (average steady-state concentration: 23 ± 9 pg ATP cm(-2)) exposed to treated aerobic groundwater [0...
January 6, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28034914/the-regulation-of-acute-immune-responses-to-the-bacterial-lung-pathogen-legionella-pneumophila
#7
REVIEW
Andrew Stephen Brown, Chao Yang, Elizabeth Louise Hartland, Ian Richard van Driel
Legionella pneumophila causes Legionnaires' disease, a severe and potentially fatal bacterial pneumonia in immunocompromised individuals. Despite the understanding that a robust inflammatory response is important for control of L. pneumophila infection, our understanding of the network of molecular and cellular events within the lung that function to clear the bacterium is not clearly understood. This review compiles our understanding of the various molecular and cellular pathways stimulated upon infection with L...
December 29, 2016: Journal of Leukocyte Biology
https://www.readbyqxmd.com/read/28029443/-presence-of-legionella-spp-in-household-drinking-water-reservoirs-in-resistencia-chaco-argentina-preliminary-report
#8
Liliana S Lösch, Luis A Merino
Legionella spp. is an environmental bacterium that can survive in a wide range of physicochemical conditions and may colonize distribution systems of drinking water and storage tanks. Legionella pneumophila is the major waterborne pathogen that can cause 90% of Legionnaires' disease cases. The aim of this study was to detect the presence of Legionella spp. in household drinking water tanks in the city of Resistencia, Chaco. The detection of Legionella in water samples was performed by culture methods as set out in ISO 11731:1998...
October 2016: Revista Argentina de Microbiología
https://www.readbyqxmd.com/read/27999694/a-case-of-pulmonary-renal-syndrome-leading-to-the-diagnosis-of-legionnaires-disease
#9
Erasmia Sabani, Pantelis A Sarafidis, Antonios Lazaridis, Theodora Kouloukourgiotou, Konstantinos Stylianou, Afroditi Pantzaki, Aikaterini Papagianni, Georgios Efstratiadis
We report a case of a 51-year-old Caucasian man referred at our department due to acute renal failure (ARF) complicating respiratory failure during hospitalization in a regional hospital. The patient was previously started on steroids due to the suspicion of rapidly progressive glomerulonephritis (RPGN) in the context of Goodpasture syndrome. However, clinical and laboratory findings did not support this diagnosis; instead a careful evaluation limited differential diagnosis of the renal insult to acute tubular necrosis or acute interstitial nephritis (AIN) following respiratory infection...
2016: Case Reports in Nephrology
https://www.readbyqxmd.com/read/27994017/legionella-pneumophila-oxyr-is-a-redundant-transcriptional-regulator-that-contributes-to-expression-control-of-the-two-component-cpxra-system
#10
Jennifer R Tanner, Palak G Patel, Jacqueline R Hellinga, Lynda J Donald, Celine Jimenez, Jason J LeBlanc, Ann Karen C Brassinga
: Nominally an environmental organism, Legionella pneumophila is an intracellular parasite of protozoa, but is also the causative agent of the pneumonia termed Legionnaires' disease that results from inhalation of aerosolized bacteria by susceptible humans. Coordination of gene expression by a number of identified regulatory factors, including OxyR, assist L. pneumophila in adapting to the stresses of these changing environments. L. pneumophila OxyR (OxyRLp) is an ortholog of E. coli OxyR; however, OxyRLp was shown elsewhere to be functionally divergent such that it acts as a transcription regulator independent of the oxidative stress response...
December 19, 2016: Journal of Bacteriology
https://www.readbyqxmd.com/read/27979936/complete-genome-sequences-of-six-legionella-pneumophila-isolates-from-two-collocated-outbreaks-of-legionnaires-disease-in-2005-and-2008-in-sarpsborg-fredrikstad-norway
#11
Marius Dybwad, Tone Aarskaug, Else-Marie Fykse, Elisabeth Henie Madslien, Janet Martha Blatny
Here, we report the complete genome sequences of Legionella pneumophila isolates from two collocated outbreaks of Legionnaires' disease in 2005 and 2008 in Sarpsborg/Fredrikstad, Norway. One clinical and two environmental isolates were sequenced from each outbreak. The genome of all six isolates consisted of a 3.36 Mb-chromosome, while the 2005 genomes featured an additional 68 kb-episome sharing high sequence similarity with the L. pneumophila Lens plasmid. All six genomes contained multiple mobile genetic elements including novel combinations of type-IVA secretion systems...
December 15, 2016: Genome Announcements
https://www.readbyqxmd.com/read/27979687/legionnaire-s-disease-since-philadelphia-lessons-learned-and-continued-progress
#12
REVIEW
Cheston B Cunha, Burke A Cunha
Legionnaire's disease has been recognized as a cause of severe community-acquired pneumonia (CAP). Legionnaire's disease has characteristic extrapulmonary findings that are the basis for a presumptive clinical diagnosis. The widespread use of Legionella culture, sputum DFA, serology, urinary antigen testing, and polymerase chain reaction have allowed earlier diagnosis of Legionnaire's disease. Excluding common source outbreaks, CAP caused by Legionnaire's disease is manifested as sporadic cases. In contrast, nosocomial Legionnaire's disease occurs in clusters or outbreaks from common Legionella species-contaminated water sources...
December 12, 2016: Infectious Disease Clinics of North America
https://www.readbyqxmd.com/read/27979686/legionnaire-s-disease-and-immunosuppressive-drugs
#13
REVIEW
Tin Han Htwe, Nancy M Khardori
Immunosuppressive agents predispose patients to legionnaire's disease. Patients receiving tumor necrosis factor antagonists are generally not severely immunocompromised by the underlying disease. In patients with malignancy receiving immunosuppressive therapies, it is difficult to balance the underlying disease versus the therapy used. Transplant recipients are often on multiple drugs, including immunosuppressants. It seems that immunosuppressive drugs add to the risk for legionella infection. The index of suspicion should be high for legionella infection early during a compatible clinical syndrome...
December 12, 2016: Infectious Disease Clinics of North America
https://www.readbyqxmd.com/read/27979685/nervous-system-abnormalities-and-legionnaire-s-disease
#14
REVIEW
John J Halperin
Although patients with Legionnaire's disease frequently develop alterations of consciousness, this is no more frequent than in patients hospitalized with other, equally severe forms of bacterial pneumonia. Legionella meningitis occurs rarely, if ever. Patients with Legionnaire's are susceptible to critical illness polyneuropathy/myopathy, as are other critically ill patients. Legionnaire's patients may develop MRI hyperdensities in the splenium of the corpus callosum, as may other patients with severe infections...
December 12, 2016: Infectious Disease Clinics of North America
https://www.readbyqxmd.com/read/27979684/laboratory-tests-for-legionnaire-s-disease
#15
REVIEW
W Michael Dunne, Nathalie Picot, Alex van Belkum
Legionella pneumophila is one of the more recently discovered bacterial pathogens of humans. The last 2 decades have seen tremendous progress in the evolution of diagnostic tests, for detection and characterization of this pathogen and for defining the host response to infection. This has generated several diagnostic tools that span the range from simple immunologic assays to modern genome sequencing. This review describes the state of affairs of this continuously evolving field regarding the diagnosis of Legionnaire's disease and covers detection, assessment of antibiotic susceptibility, and epidemiologic characterization of isolates of L pneumophila and other pathogenic species within the genus...
December 12, 2016: Infectious Disease Clinics of North America
https://www.readbyqxmd.com/read/27979683/nosocomial-health-care-associated-legionnaire-s-disease
#16
REVIEW
Shanu Agarwal, Virginia Abell, Thomas M File
Nosocomial legionnaire's disease is most frequently associated with presence of the organism in hospital water systems. Patients are often susceptible as a result of age, underlying comorbidities, or immunosuppression. Prevention focuses on reducing the reservoir within water systems and includes super heating, ultraviolent light, chlorination, silver-copper ionization, and distal filtration. This article reviews the epidemiology of health care-associated legionnaire's disease, reviews characteristics of several health care-associated outbreaks, and discusses strategies to prevent health care-associated infection...
December 12, 2016: Infectious Disease Clinics of North America
https://www.readbyqxmd.com/read/27964907/occurrence-of-legionella-in-uk-household-showers
#17
Samuel Collins, David Stevenson, Allan Bennett, Jimmy Walker
Household water systems have been proposed as a source of sporadic, community acquired Legionnaires' disease. Showers represent a frequently used aerosol generating device in the domestic setting yet little is known about the occurrence of Legionella spp. in these systems. This study has investigated the prevalence of Legionella spp. by culture and qPCR in UK household showers. Ninety nine showers from 82 separate properties in the South of England were sampled. Clinically relevant Legionella spp. were isolated by culture in 8% of shower water samples representing 6% of households...
December 2, 2016: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/27941800/modulation-of-membrane-phosphoinositide-dynamics-by-the-phosphatidylinositide-4-kinase-activity-of-the-legionella-lepb-effector
#18
Na Dong, Miao Niu, Liyan Hu, Qing Yao, Rui Zhou, Feng Shao
Legionella pneumophila, the causative bacterium for Legionnaires' disease, hijacks host membrane trafficking for the maturation of the Legionella-containing vacuole (LCV). The LCV membrane mainly contains PtdIns4P, which is important for anchoring many secreted Legionella effectors onto the LCV. Here, we identify a cryptic functional domain (LepB_NTD) preceding the well-characterized RabGAP domain in the Legionella Dot/Icm type IV secretion system effector LepB. LepB_NTD alone is toxic to yeast and can disrupt the Golgi in mammalian cells...
December 12, 2016: Nature Microbiology
https://www.readbyqxmd.com/read/27924178/a-comparative-study-of-the-epidemiological-aspects-of-legionnaires-disease-outbreaks-in-korea-and-japan-2010-2014
#19
Bok-Soon Han, Myeong-Jin Lee, Young-Hwan Kwon, Won-Chang Lee
BACKGROUND: In the present study, we compared the epidemiological aspects of Legionnaire' disease (LD) outbreaks in Korea and Japan by analyzing the current state from 2010 to 2014. METHODS: The following factors were analyzed: nationwide cumulative incidence rate (CIR) per 100,000 populations and case-fatality rate in percentage, epidemiological aspects (i.e., case related to gender), male to female morbidity ratio (MFMR), age, seasonality and habitat distribution of LD cases...
January 2017: Journal of Clinical Medicine Research
https://www.readbyqxmd.com/read/27919312/lessons-from-an-outbreak-of-legionnaires-disease-on-a-hematology-oncology-unit
#20
Louise K Francois Watkins, Karrie-Ann E Toews, Aaron M Harris, Sherri Davidson, Stephanie Ayers-Millsap, Claressa E Lucas, Brian C Hubbard, Natalia A Kozak-Muiznieks, Edward Khan, Preeta K Kutty
OBJECTIVES To define the scope of an outbreak of Legionnaires' disease (LD), to identify the source, and to stop transmission. DESIGN AND SETTING Epidemiologic investigation of an LD outbreak among patients and a visitor exposed to a newly constructed hematology-oncology unit. METHODS An LD case was defined as radiographically confirmed pneumonia in a person with positive urinary antigen testing and/or respiratory culture for Legionella and exposure to the hematology-oncology unit after February 20, 2014. Cases were classified as definitely or probably healthcare-associated based on whether they were exposed to the unit for all or part of the incubation period (2-10 days)...
December 6, 2016: Infection Control and Hospital Epidemiology
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