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47 ud af 47 tidsskrifter valgt, søgeord (legionella) valgt, emner højest 180 dage gamle, sorteret efter nyeste først.
9 emner vises.
BMC Infectious Diseases, 23.04.2024
Tilføjet 23.04.2024
Abstract Background Severe acute respiratory infection (SARI), a significant global health concern, imposes a substantial disease burden. In China, there is inadequate data concerning the monitoring of respiratory pathogens, particularly bacteria, among patients with SARI. Therefore, this study aims to delineate the demographic, epidemiological, and aetiological characteristics of hospitalised SARI patients in Central China between 2018 and 2020. Methods Eligible patients with SARI admitted to the First Affiliated Hospital of Zhengzhou University between 1 January 2018 and 31 December 2020 were included in this retrospective study. Within the first 24 h of admission, respiratory (including sputum, nasal/throat swabs, bronchoalveolar lavage fluid, thoracocentesis fluid, etc.), urine, and peripheral blood specimens were collected for viral and bacterial testing. A multiplex real-time polymerase chain reaction (PCR) diagnostic approach was used to identify human influenza virus, respiratory syncytial virus, parainfluenza virus, adenovirus, human bocavirus, human coronavirus, human metapneumovirus, and rhinovirus. Bacterial cultures of respiratory specimens were performed with a particular focus on pathogenic microorganisms, including S. pneumoniae, S. aureus, K. pneumoniae, P. aeruginosa, Strep A, H. influenzae, A. baumannii, and E. coli. In cases where bacterial culture results were negative, nucleic acid extraction was performed for PCR to assay for the above-mentioned eight bacteria, as well as L. pneumophila and M. pneumoniae. Additionally, urine specimens were exclusively used to detect Legionella antigens. Furthermore, epidemiological, demographic, and clinical data were obtained from electronic medical records. Results The study encompassed 1266 patients, with a mean age of 54 years, among whom 61.6% (780/1266) were males, 61.4% (778/1266) were farmers, and 88.8% (1124/1266) sought medical treatment in 2020. Moreover, 80.3% (1017/1266) were housed in general wards. The most common respiratory symptoms included fever (86.8%, 1122/1266) and cough (77.8%, 986/1266). Chest imaging anomalies were detected in 62.6% (792/1266) of cases, and 58.1% (736/1266) exhibited at least one respiratory pathogen, with 28.5% (361/1266) having multiple infections. Additionally, 95.7% (1212/1266) of the patients were from Henan Province, with the highest proportion (38.3%, 486/1266) falling in the 61–80 years age bracket, predominantly (79.8%, 1010/1266) seeking medical aid in summer and autumn. Bacterial detection rate (39.0%, 495/1266) was higher than viral detection rate (36.9%, 468/1266), with the primary pathogens being influenza virus (13.8%, 175/1266), K. pneumoniae (10.0%, 127/1266), S. pneumoniae (10.0%, 127/1266), adenovirus (8.2%, 105/1266), P. aeruginosa (8.2%, 105/1266), M. pneumoniae (7.8%, 100/1266), and respiratory syncytial virus (7.7%, 98/1266). During spring and winter, there was a significant prevalence of influenza virus and human coronavirus, contrasting with the dominance of parainfluenza viruses in summer and autumn. Respiratory syncytial virus and rhinovirus exhibited higher prevalence across spring, summer, and winter. P. aeruginosa, K. pneumoniae, and M. pneumoniae were identified at similar rates throughout all seasons without distinct spikes in prevalence. However, S. pneumoniae showed a distinctive pattern with a prevalence that doubled during summer and winter. Moreover, the positive detection rates of various other viruses and bacteria were lower, displaying a comparatively erratic prevalence trend. Among patients admitted to the intensive care unit, the predominant nosocomial bacteria were K. pneumoniae (17.2%, 43/249), A. baumannii (13.6%, 34/249), and P. aeruginosa (12.4%, 31/249). Conversely, in patients from general wards, predominant pathogens included influenza virus (14.8%, 151/1017), S. pneumoniae (10.4%, 106/1017), and adenovirus (9.3%, 95/1017). Additionally, paediatric patients exhibited significantly higher positive detection rates for influenza virus (23.9%, 11/46) and M. pneumoniae (32.6%, 15/46) compared to adults and the elderly. Furthermore, adenovirus (10.0%, 67/669) and rhinovirus (6.4%, 43/669) were the primary pathogens in adults, while K. pneumoniae (11.8%, 65/551) and A. baumannii (7.1%, 39/551) prevailed among the elderly, indicating significant differences among the three age groups. Discussion In Central China, among patients with SARI, the prevailing viruses included influenza virus, adenovirus, and respiratory syncytial virus. Among bacteria, K. pneumoniae, S. pneumoniae, P. aeruginosa, and M. pneumoniae were frequently identified, with multiple infections being very common. Additionally, there were substantial variations in the pathogen spectrum compositions concerning wards and age groups among patients. Consequently, this study holds promise in offering insights to the government for developing strategies aimed at preventing and managing respiratory infectious diseases effectively.
Læs mere Tjek på PubMedM. Rigter, S.E. van Roeden, R. Barth, M. Wegdam-Blans
Clinical Microbiology and Infection, 6.04.2024
Tilføjet 6.04.2024
Amongst hospitalized CAP patients in the Netherlands, atypical pathogens were identified in 0-30%, with variation depending on season, selection of patient population and type of ward. (1) Molecular tests play a crucial role in the diagnostic field of atypical respiratory pathogens (Chlamydia pneumoniae, Chlamydia psittaci, Coxiella burnetii, Legionella pneumophila and Mycoplasma pneumoniae), since they are typically not detected with standard diagnostic methods. (2) Polymerase chain reactions (PCRs) targeting these pathogens are frequently requested in the three academic hospitals served by our microbiological facility (University Medical Center Utrecht (adult tertiary facility), Wilhelmina Children\'s Hospital (pediatric tertiary facility) and Princess Maxima Center (pediatric oncological facility), but the yield and clinical consequences of these diagnostics in daily practice are unclear.
Læs mere Tjek på PubMedMinjia ChenXiuqin CaoRonghui ZhengHaixia ChenRuixia HeHao ZhouZhiwei Yanga Department of Pathogenic Biology and Medical Immunology, School of Basic Medicine, Ningxia Medical University, Yinchuan, Chinab Key Laboratory of Fertility Preservation and Maintenance, Ministry of Education, School of Basic Medicine, Ningxia Medical University, Yinchuan, China
Virulence, 3.04.2024
Tilføjet 3.04.2024
Minjia ChenXiuqin CaoRonghui ZhengHaixia ChenRuixia HeHao ZhouZhiwei Yanga Department of Pathogenic Biology and Medical Immunology, School of Basic Medicine, Ningxia Medical University, Yinchuan, Chinab Key Laboratory of Fertility Preservation and Maintenance, Ministry of Education, School of Basic Medicine, Ningxia Medical University, Yinchuan, China
Virulence, 12.03.2024
Tilføjet 12.03.2024
Satoshi Kutsuna, Hiroyuki Ohbe, Hiroki Matsui, Hideo Yasunaga
International Journal of Infectious Diseases, 15.02.2024
Tilføjet 15.02.2024
Legionnaires’ Disease is a type of pneumonia caused by Legionella spp. such as L. pneumophila, L. longbeachae and L. anisa., and accounts for 1–10% of community-acquired pneumonia cases 1. It is a severe form of pneumonia with a reported fatality rate of 6.4%4. Multiple reports have shown that a delay in the administration of appropriate antimicrobials is associated with worse prognosis in Legionnaires’ Disease 2.
Læs mere Tjek på PubMedBMC Infectious Diseases, 2.01.2024
Tilføjet 2.01.2024
Abstract Background Respiratory tract infections (RTIs) are a major global health burden due to their high morbidity and mortality. This retrospective study described the epidemiology of respiratory pathogens in adults over a 5-year period at an Australian tertiary healthcare network. Methods All multiplex reverse transcription polymerase chain reaction respiratory samples taken between the 1st of November 2014 and the 31st of October 2019 were included in this study. Overall prevalence and variations according to seasons, age groups and sex were analysed, as well as factors associated with prolonged hospital and intensive care length of stay. Results There were 12,453 pathogens detected amongst the 12,185 positive samples, with coinfection rates of 3.7%. Picornavirus (Rhinovirus), Influenza A and respiratory syncytial virus were the most commonly detected pathogens. Mycoplasma pneumoniae was the most commonly detected atypical bacteria. Significant differences in the prevalence of Chlamydia pneumoniae and Human metapneumovirus infections were found between sexes. Longest median length of intensive care and hospital stay was for Legionella species. Seasonal variations were evident for certain pathogens. Conclusions The high rates of pathogen detection and hospitalisation in this real-world study highlights the significant burden of RTIs, and the urgent need for an improved understanding of the pathogenicity as well as preventative and treatment options of RTIs.
Læs mere Tjek på PubMedPei-Xing XuHong-Yu RenNa ZhaoXiao-Jing JinBo-Hai WenTian Qin1National Key Laboratory of Intelligent Tracking and Forecasting for Infectious Diseases, Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases, National Institute for Communicable Disease Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing, China2Pathogen and Biosecurity, Beijing Institute of Microbiology and Epidemiology, Beijing, China, Igor E. Brodsky
Infection and Immunity, 16.12.2023
Tilføjet 16.12.2023
Ritika Chatterjee, Subba Rao Gangi Setty, Dipshikha Chakravortty
Trends in Microbiology, 1.12.2023
Tilføjet 1.12.2023
In the tug-of-war between host and pathogen, both evolve to combat each other\'s defence arsenals. Intracellular phagosomal bacteria have developed strategies to modify the vacuolar niche to suit their requirements best. Conversely, the host tries to target the pathogen-containing vacuoles towards the degradative pathways. The host cells use a robust system through intracellular trafficking to maintain homeostasis inside the cellular milieu. In parallel, intracellular bacterial pathogens have coevolved with the host to harbour strategies to manipulate cellular pathways, organelles, and cargoes, facilitating the conversion of the phagosome into a modified pathogen-containing vacuole (PCV). Key molecular regulators of intracellular traffic, such as changes in the organelle (phospholipid) composition, recruitment of small GTPases and associated effectors, soluble N-ethylmaleimide-sensitive factor-activating protein receptors (SNAREs), etc., are hijacked to evade lysosomal degradation. Legionella, Salmonella, Coxiella, Chlamydia, Mycobacterium, and Brucella are examples of pathogens which diverge from the endocytic pathway by using effector-mediated mechanisms to overcome the challenges and establish their intracellular niches. These pathogens extensively utilise and modulate the end processes of secretory pathways, particularly SNAREs, in repurposing the PCV into specialised compartments resembling the host organelles within the secretory network; at the same time, they avoid being degraded by the host\'s cellular mechanisms. Here, we discuss the recent research advances on the host–pathogen interaction/crosstalk that involves host SNAREs, conserved cellular processes, and the ongoing host–pathogen defence mechanisms in the molecular arms race against each other. The current knowledge of SNAREs, and intravacuolar bacterial pathogen interactions, enables us to understand host cellular innate immune pathways, maintenance of homeostasis, and potential therapeutic strategies to combat ever-growing antimicrobial resistance.
Læs mere Tjek på PubMedLegionella pneumophila inhibits type I interferon signaling to avoid cell-intrinsic host cell defense
Charles N. S. AllenDallas A. BanksMichael ShusterStefanie N. VogelTamara J. O’ConnorVolker Briken 1 Department of Cell Biology and Molecular Genetics, University of Maryland, College Park, Maryland, USA 2 Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland, USA 3 Department of Biological Chemistry, Johns Hopkins University School of Medicine, Baltimore, Maryland, USA , Andreas J. Bäumler
Infection and Immunity, 27.11.2023
Tilføjet 27.11.2023