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infection bloodstream

Manjula Ramya Vutukuru, Divya Khandige Sharma, M S Ragavendar, Susanne Schmolke, Yiwei Huang, Walter Gumbrecht, Nivedita Mitra
Molecular diagnostics is a promising alternative to culture based methods for the detection of bloodstream infections, notably due to its overall lower turnaround time when starting directly from patient samples. Whole blood is usually the starting diagnostic sample in suspected bloodstream infections. The detection of low concentrations of pathogens in blood using a molecular assay necessitates a fairly high starting volume of blood sample in the range of 5-10mL. This large volume of blood sample has a substantial accompanying human genomic content that interferes with pathogen detection...
October 17, 2016: Journal of Microbiological Methods
Weiwei Wang, Ting Jiang, Weihong Zhang, Chunyu Li, Jun Chen, Dandan Xiang, Kejiang Cao, Lian-Wen Qi, Ping Li, Wei Zhu, Wensen Chen, Yan Chen
The study was undertaken to describe the profile of patients and the characteristics of all multidrug-resistant gram-negative bacteria (MDR-GNB) and to assess mortality. We examined 138 patients with bloodstream infections (BSIs) caused by MDR-GNB. Clinical characteristics, antibiotic therapy, and in-hospital mortality were analyzed. Survivor and nonsurvivor subgroups were compared to identify predictors of mortality. The in-hospital mortality rate was 25.4%. Univariate analysis revealed that comorbidities and inadequate initial antimicrobial treatment could increase risk of death...
October 17, 2016: American Journal of Infection Control
Voon Kin Chin, Tze Yan Lee, Basir Rusliza, Pei Pei Chong
Candida bloodstream infections remain the most frequent life-threatening fungal disease, with Candida albicans accounting for 70% to 80% of the Candida isolates recovered from infected patients. In nature, Candida species are part of the normal commensal flora in mammalian hosts. However, they can transform into pathogens once the host immune system is weakened or breached. More recently, mortality attributed to Candida infections has continued to increase due to both inherent and acquired drug resistance in Candida, the inefficacy of the available antifungal drugs, tedious diagnostic procedures, and a rising number of immunocompromised patients...
October 18, 2016: International Journal of Molecular Sciences
C O'Connor, M G Kiernan, C Finnegan, J Powell, L Power, N H O'Connell, C P Dunne
BACKGROUND: The Mid-West of Ireland has higher than average national rates of invasive extended-spectrum beta-lactamase (ESBL) bloodstream infections and carbapenemase-producing Enterobacteriaceae (CPE), with increasing numbers of ESBL isolates detected in community-dwelling patients. AIMS: To conduct a point prevalence study in a convenience sample of the Mid-West population with the aim of determining the extent of ESBL colonisation. METHODS: Utilising anonymised community stool samples that had completed routine analysis, we conducted a point prevalence study over a 4-week period on all samples that met defined inclusion and exclusion criteria...
September 24, 2016: Irish Journal of Medical Science
Ewa Szwejser, B M Lidy Verburg-van Kemenade, Magdalena Maciuszek, Magdalena Chadzinska
Clinical and experimental evidence shows that estrogens affect immunity in mammals. Less is known about this interaction in the evolutionary older, non-mammalian, vertebrates. Fish form an excellent model to identify evolutionary conserved neuroendocrine-immune interactions: i) they are the earliest vertebrates with fully developed innate and adaptive immunity, ii) immune and endocrine parameters vary with season iii) physiology is constantly disrupted by increasing contamination of the aquatic environment...
October 16, 2016: Hormones and Behavior
Frank Günther, Uta Merle, Uwe Frank, Matthias M Gaida, Nico T Mutters
BACKGROUND: Achromobacter xylosoxidans (AX) is known for intrinsic resistance to disinfectants. Our laboratory routine surveillance system detected an unexpected rise in AX bloodstream infections in a 2200-bed hospital. An epidemiological investigation was conducted to find the source and disrupt further transmission. METHODS: Outbreak cases were defined as patients with at least one positive blood culture positive for AX from May 2014 to May 2015. Medical records were reviewed, affected wards, as well as the microbiology laboratory were audited...
October 19, 2016: BMC Infectious Diseases
Alessandro Cassini, Diamantis Plachouras, Tim Eckmanns, Muna Abu Sin, Hans-Peter Blank, Tanja Ducomble, Sebastian Haller, Thomas Harder, Anja Klingeberg, Madlen Sixtensson, Edward Velasco, Bettina Weiß, Piotr Kramarz, Dominique L Monnet, Mirjam E Kretzschmar, Carl Suetens
BACKGROUND: Estimating the burden of healthcare-associated infections (HAIs) compared to other communicable diseases is an ongoing challenge given the need for good quality data on the incidence of these infections and the involved comorbidities. Based on the methodology of the Burden of Communicable Diseases in Europe (BCoDE) project and 2011-2012 data from the European Centre for Disease Prevention and Control (ECDC) point prevalence survey (PPS) of HAIs and antimicrobial use in European acute care hospitals, we estimated the burden of six common HAIs...
October 2016: PLoS Medicine
Silvia Gómez-Zorrilla, Francisco Morandeira, María José Castro, Fe Tubau, Elisabet Periche, Rosario Cañizares, María Angeles Dominguez, Javier Ariza, Carmen Peña
The severity of Pseudomonas aeruginosa (PA) infection may be determined by the interaction with the host immune system. We designed a prospective study to assess the relationship between the inflammatory response and the clinical presentation and outcome of PA infection. We also investigated whether there are differences in the inflammatory response depending on the resistance profile of PA. Interleukin-6 (IL-6), IL-10, procalcitonin (PCT), and C-reactive protein (CRP) were measured. Sixty-nine infection episodes were recorded; 40 caused by non-multidrug-resistant (non-MDR) strains [29 (73%) respiratory; 8 (20%) bacteremia], 12 by MDR non-extensively drug-resistant (MDR-non-XDR) [9 (75%) respiratory; 3 (25%) bacteremia], and 17 by XDR strains [9 (53%) respiratory; 7 (41%) bacteremia]...
October 18, 2016: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
Heloise Buys, Rudzani Muloiwa, Colleen Bamford, Brian Eley
BACKGROUND: Klebsiella pneumoniae (KP) is a significant paediatric bloodstream pathogen in children. There is little data from Africa. In this study we describe the epidemiology of multi-drug resistant Klebsiella pneumoniae bloodstream infection (KPBSI) at Red Cross War Memorial Children's Hospital, Cape Town, South Africa. METHODS: We conducted a retrospective cross-sectional study of KPBSI from 1 January 2006 to 31 December 2011 using conventional descriptive and inferential statistical methods...
October 17, 2016: BMC Infectious Diseases
Ana Flores-Carrero, Indira Labrador, Alberto Paniz-Mondolfi, David R Peaper, Dana Towle, María Araque
Enterobacter spp. have emerged as an important group of pathogens linked to outbreaks in neonatal intensive care units (NICUs), usually involving strains expressing extended-spectrum β-lactamases (ESBLs). The aim of this study was to describe the first nosocomial bloodstream infection outbreak caused by Enterobacter ludwigii co-harbouring CTX-M-8, SHV-12 and TEM-15 in a NICU in a Venezuelan hospital. Initial bacterial identification was achieved by VITEK(®)2 system and matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry (VITEK(®) MS) and was subsequently confirmed by nucleotide sequencing of the 16S rDNA gene and hsp60 genotyping...
October 7, 2016: Journal of Global Antimicrobial Resistance
Adam W Bartlett, Ben Smith, C R Robert George, Brendan McMullan, Alison Kesson, Monica M Lahra, Dip Paed, Pamela Palasanthiran
BACKGROUND: Group B Streptococcus (GBS) is a recognized cause of sepsis and meningitis, particularly in infants. Early onset (<7 days) GBS disease has been well characterized, whereas the epidemiology of late onset disease (LOD, 7-89 days) and very late onset disease (VLOD, ≥90 days) is less well understood. The aims of this study were to assess risk factors, presentation, management, and outcome for GBS LOD and VLOD. METHODS: Microbiology laboratory databases and hospital diagnostic coding for Sydney Children's Hospital and the Children's Hospital at Westmead were investigated for patients ≥ 7 days of age diagnosed with GBS bloodstream infection or meningitis from 1st January 2000 to 31st December 2014 (15 years)...
October 3, 2016: Pediatric Infectious Disease Journal
Michail Alevizakos, Styliani Karanika, Marios Detsis, Eleftherios Mylonakis
Cancer patients are vulnerable to infections, including those with extended-spectrum β-lactamase-producing Enterobacteriaceae (ESBL-PE), and most of these infections are associated with colonisation of the gastrointestinal tract. The aim of this study was to estimate the prevalence of gastrointestinal colonisation with ESBL-PE cancer populations and to determine the risk for subsequent bloodstream infection (BSI) with these pathogens. PubMed and EMBASE databases were searched from 1 January 1991 to 1 March 2016 to identify studies regarding ESBL-PE colonisation among patients with malignancies...
October 6, 2016: International Journal of Antimicrobial Agents
Víctor Daniel Rosenthal, Hail M Al-Abdely, Amani Ali El-Kholy, Safa A Aziz AlKhawaja, Hakan Leblebicioglu, Yatin Mehta, Vineya Rai, Nguyen Viet Hung, Souha Sami Kanj, Mona Foda Salama, Estuardo Salgado-Yepez, Naheed Elahi, Rayo Morfin Otero, Anucha Apisarnthanarak, Braulio Matias De Carvalho, Bat Erdene Ider, Dale Fisher, Maria Carmen S G Buenaflor, Michael M Petrov, Ana Marcela Quesada-Mora, Farid Zand, Vaidotas Gurskis, Tanja Anguseva, Aamer Ikram, Daisy Aguilar de Moros, Wieslawa Duszynska, Nepomuceno Mejia, Florin George Horhat, Vladislav Belskiy, Vesna Mioljevic, Gabriela Di Silvestre, Katarina Furova, Gloria Y Ramos-Ortiz, May Osman Gamar Elanbya, Hindra Irawan Satari, Umesh Gupta, Tarek Dendane, Lul Raka, Humberto Guanche-Garcell, Bijie Hu, Denis Padgett, Kushlani Jayatilleke, Najla Ben Jaballah, Eleni Apostolopoulou, Walter Enrique Prudencio Leon, Alejandra Sepulveda-Chavez, Hector Miguel Telechea, Andrew Trotter, Carlos Alvarez-Moreno, Luis Kushner-Davalos
BACKGROUND: We report the results of International Nosocomial Infection Control Consortium (INICC) surveillance study from January 2010-December 2015 in 703 intensive care units (ICUs) in Latin America, Europe, Eastern Mediterranean, Southeast Asia, and Western Pacific. METHODS: During the 6-year study period, using Centers for Disease Control and Prevention National Healthcare Safety Network (CDC-NHSN) definitions for device-associated health care-associated infection (DA-HAI), we collected prospective data from 861,284 patients hospitalized in INICC hospital ICUs for an aggregate of 3,506,562 days...
October 11, 2016: American Journal of Infection Control
Guillaume Butler-Laporte, Matthew P Cheng, Alexandre P Cheng, Emily G McDonald, Todd C Lee
BACKGROUND: Bloodstream infections with Staphylococcus aureus are clinically significant and are often treated with empiric methicillin resistance (MRSA) coverage. However, vancomycin has associated harms. We hypothesized that MRSA screening correlated with resistance in S. aureus bacteremia and could help determine empiric vancomycin requirement. METHODS: We reviewed consecutive S. aureus bacteremias over a five-year period at two tertiary care hospitals. MRSA colonization was evaluated in three ways: as tested within 30 days of bacteremia (30-Day criteria), as tested within 30 days but accounting for any prior positive results (ever positive criteria), or if the patient was known positive with patients with unknown MRSA status being labeled negative (known positive criteria)...
October 10, 2016: Antimicrobial Agents and Chemotherapy
Reinhild Feuerstein, Julia Kolter, Philipp Henneke
The dermis, a major reservoir of immune cells in immediate vicinity to the colonizing skin microflora, serves as an important site of host-pathogen interactions. Macrophages (Mϕ) are the most frequent resident immune cell type in the dermis. They protect the host from invasive infections by highly adapted bacteria, such as staphylococci via pattern recognition of bacterial effectors, phagocytosis, and recruitment of other myeloid cells from the blood. Already under homeostatic conditions, the dermal Mϕ population receives a dynamic input of monocytes invading from the bloodstream...
October 12, 2016: Journal of Leukocyte Biology
Manuel Saldivia, Gloria Ceballos-Pérez, Jean-Mathieu Bart, Miguel Navarro
During infection in mammals, the protozoan parasite Trypanosoma brucei transforms from a proliferative bloodstream form to a quiescent form that is pre-adapted to host transition. AMP analogs are known to induce quiescence and also inhibit TbTOR4. To examine the role of AMP-activated kinase (AMPK) in the regulation of this developmental transition, we characterized trypanosome TbAMPK complexes. Expression of a constitutively active AMPKα1 induces quiescence of the infective form, and TbAMPKα1 phosphorylation occurs during differentiation of wild-type pleomorphic trypanosomes to the quiescent stumpy form in vivo...
October 11, 2016: Cell Reports
Masamitsu Kono, M Ammar Zafar, Marisol Zuniga, Aoife M Roche, Shigeto Hamaguchi, Jeffrey N Weiser
Herein, we studied a virulent isolate of the leading bacterial pathogen Streptococcus pneumoniae in an infant mouse model of colonization, disease and transmission, both with and without influenza A (IAV) co-infection. To identify vulnerable points in the multiple steps involved in pneumococcal pathogenesis, this model was utilized for a comprehensive analysis of population bottlenecks. Our findings reveal that in the setting of IAV co-infection the organism must pass through single cell bottlenecks during bloodstream invasion from the nasopharynx within the host and in transmission between hosts...
October 2016: PLoS Pathogens
Eric Piver, Audrey Boyer, Julien Gaillard, Anne Bull, Elodie Beaumont, Philippe Roingeard, Jean-Christophe Meunier
OBJECTIVE: HCV particles are associated with very low-density lipoprotein components in chronically infected patients. These hybrid particles, or 'lipo-viro particles' (LVPs), are rich in triglycerides, and contain the viral RNA, the capsid protein, E1E2 envelope glycoproteins and apolipoproteins B and E. However, their specific ultrastructural organisation has yet to be determined. We developed a strategy for the preparation of any viral sample that preserves the native structure of the LVPs, facilitating their precise morphological characterisation...
October 11, 2016: Gut
Angeliki Mavroidi, Maria Katsiari, Eleftheria Palla, Sofia Likousi, Zoi Roussou, Charikleia Nikolaou, Evangelia D Platsouka
A rapid increase was observed in the incidence of extensively drug-resistant Acinetobacter baumannii (XDR Aba) isolates in a Greek hospital during 2014. To investigate the causes of this rise, the antimicrobial resistance profiles of all carbapenem-resistant (CARB-R) Aba isolates recovered during 2014-2015 were determined. Selected XDR Aba isolates (n = 13) were characterized by molecular methods. XDR Aba (48 isolates) represented 21.4% of the 224 CARB-R Aba recovered during the study period. The 13 selected XDR Aba isolates were positive for the blaOXA-23, the intrinsic blaOXA-51, and the adeB gene of the AdeABC efflux pump, and all belonged to the 3LST ST101, corresponding to the international clone II...
October 11, 2016: Microbial Drug Resistance: MDR: Mechanisms, Epidemiology, and Disease
Raquel M Martinez, Donna M Wolk
Bacteremia and sepsis are conditions associated with high mortality and are of great impact to health care operations. Among the top causes of mortality in the United States, these conditions cause over 600 fatalities each day. Empiric, broad-spectrum treatment is a common but often a costly approach that may fail to effectively target the correct microbe, may inadvertently harm patients via antimicrobial toxicity or downstream antimicrobial resistance. To meet the diagnostic challenges of bacteremia and sepsis, laboratories must understand the complexity of diagnosing and treating septic patients, in order to focus on creating algorithms that can help direct a more targeted approach to antimicrobial therapy and synergize with existing clinical practices defined in new Surviving Sepsis Guidelines...
August 2016: Microbiology Spectrum
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