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https://www.readbyqxmd.com/read/28735462/effect-of-decreased-bcaa-synthesis-through-disruption-of-ilvc-gene-on-the-virulence-of-streptococcus-pneumoniae
#1
Gyu-Lee Kim, Seungyeop Lee, Truc Thanh Luong, Cuong Thach Nguyen, Sang-Sang Park, Suhkneung Pyo, Dong-Kwon Rhee
Streptococcus pneumoniae (pneumococcus) is responsible for significant morbidity and mortality worldwide. It causes a variety of life-threatening infections such as pneumonia, bacteremia, and meningitis. In bacterial physiology, the metabolic pathway of branched-chain amino acids (BCAAs) plays an important role in virulence. Nonetheless, the function of IlvC, one of the enzymes involved in the biosynthesis of BCAAs, in S. pneumoniae remains unclear. Here, we demonstrated that downregulation of BCAA biosynthesis by ilvC ablation can diminish BCAA concentration and expression of pneumolysin (Ply) and LytA, and subsequently attenuate virulence...
July 22, 2017: Archives of Pharmacal Research
https://www.readbyqxmd.com/read/28735313/early-kpc-producing-klebsiella-pneumoniae-bacteremia-among-intensive-care-unit-patients-non-colonized-upon-admission
#2
Matthaios Papadimitriou-Olivgeris, Fotini Fligou, Iris Spiliopoulou, Christina Bartzavali, Vasiliki Dodou, Sophia Vamvakopoulou, Kyriaki Koutsileou, Anastasia Zotou, Evangelos D Anastassiou, Myrto Christofidou, Markos Marangos
Among 140 patients colonized by KPC-producing Klebsiella pneumoniae (KPC-Kp) between fourth and seventh day of Intensive Care Unit stay, 24 developed bacteraemia immediately after colonization. Colistin-resistance of the colonizing isolate was the factor significantly associated with early KPC-Kp bacteraemia (P < 0.001; OR 6.6, 95% CI 2.4-18.4), a worrisome finding since infections by colistin-resistant isolates is associated with increased mortality due to limited remaining therapeutic options.
July 6, 2017: Polish Journal of Microbiology
https://www.readbyqxmd.com/read/28733286/the-regulator-ldhr-and-the-d-lactate-dehydrogenase-ldha-of-burkholderia-multivorans-play-a-role-in-carbon-overflow-and-in-planktonic-cellular-aggregates-formation
#3
Inês N Silva, Marcelo J Ramires, Lisa A Azevedo, Ana R Guerreiro, Andreia C Tavares, Jörg D Becker, Leonilde M Moreira
LysR-type transcriptional regulators (LTTR) are the most commonly found regulators in Burkholderia cepacia complex, comprising opportunistic pathogens causing chronic respiratory infections in cystic fibrosis (CF) patients. Despite LTTRs being global regulators of pathogenicity in several bacteria, few have been characterized in Burkholderia Here, we showed that gene ldhR of B. multivorans encoding a LTTR is co-transcribed with ldhA encoding a d-lactate dehydrogenase, and evaluate their implication in virulence traits like exopolysaccharide (EPS) synthesis and biofilm formation...
July 21, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28733122/the-effect-of-eosinopenia-on-mortality-in-patients-with-intracerebral-hemorrhage
#4
Asli Bolayir, Burhanettin Cigdem, Seyda Figul Gokce, Hasan Ata Bolayir, Ozlem Kayim Yildiz, Ertugrul Bolayir, Suat Ahmet Topaktas
INTRODUCTION: Inflammation may determine the prognosis of intracerebral hemorrhage (ICH), which has high mortality and morbidity rates. Recent studies have increasingly demonstrated eosinopenia as a prognostic factor, particularly in bacteremia, chronic obstructive pulmonary disease, and myocardial and cerebral infarction. Nonetheless, its significance regarding the determination of prognosis in patients with ICH has not yet been clarified. MATERIALS AND METHODS: Our study included 296 patients who presented to our clinic within 24 hours of the onset of symptoms and who were diagnosed with ICH between January 2008 and June 2016, along with 180 age- and sex-matched controls...
July 19, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28731899/current-perspectives-on-invasive-nontyphoidal-salmonella-disease
#5
Andrea H Haselbeck, Ursula Panzner, Justin Im, Stephen Baker, Christian G Meyer, Florian Marks
PURPOSE OF REVIEW: We searched PubMed for scientific literature published in the past 2 years for relevant information regarding the burden of invasive nontyphoidal Salmonella disease and host factors associated with nontyphoidal Salmonella infection and discuss current knowledge on vaccine development. The following search terms were used: Salmonella, non typhoidal/nontyphoidal, NTS, disease, bloodstream infection, invasive, sepsis/septicaemia/septicemia, bacteraemia/bacteremia, gastroenteritis, incidence, prevalence, morbidity, mortality, case fatality, host/risk factor, vaccination, and prevention/control...
July 20, 2017: Current Opinion in Infectious Diseases
https://www.readbyqxmd.com/read/28730571/early-trigeminal-nerve-involvement-in-listeria-monocytogenes-rhombencephalitis-case-series-and-systematic-review
#6
William K Karlsson, Zitta Barrella Harboe, Casper Roed, Jeppe B Monrad, Mette Lindelof, Vibeke Andrée Larsen, Daniel Kondziella
Listeria monocytogenes is associated with rhombencephalitis. However, the exact mechanisms of brainstem invasion remains poorly understood. Here, we demonstrate clinical and radiological data suggesting that Listeria may invade the brainstem via the trigeminal nerve. Three females (41, 64 and 70 years) with culture proven L. monocytogenes bacteremia and rhombencephalitis were investigated in the period of 2014-16. T2-weighted and contrast-enhanced T1-weighted MRI revealed a cerebellopontine abscess in all three patients, including the involvement of the trigeminal nerve root...
July 20, 2017: Journal of Neurology
https://www.readbyqxmd.com/read/28730157/streptobacillus-moniliformis-bacteremia-in-a-pet-shop-employee-case-report-and-literature-review
#7
Kiyozumi Suzuki, Yuji Hirai, Fujiko Morita, Ayako Nakamura, Yuki Uehara, Toshio Naito
A 39-year-old pet shop employee who sustained a bite from one of his store's rats developed fever and arthritis. Streptobacillus moniliformis was cultured from the patient's blood, confirming a diagnosis of rat-bite fever. Treatment with standard antibiotics was successful. Although rat-bite fever is commonly considered a zoonosis transmitted by wild or laboratory rats, our case emphasizes that it may be transmitted by pet animals as well.
2017: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/28729240/empiric-antibiotic-use-and-susceptibility-in-infants-with-bacterial-infections-a-multicenter-retrospective-cohort-study
#8
Elana A Feldman, Russell J McCulloh, Angela L Myers, Paul L Aronson, Mark I Neuman, Miranda C Bradford, Elizabeth R Alpern, Frances Balamuth, Mercedes M Blackstone, Whitney L Browning, Katie Hayes, Rosalynne Korman, Rianna C Leazer, Lise E Nigrovic, Richard Marble, Emily Roben, Derek J Williams, Joel S Tieder
OBJECTIVES: To assess hospital differences in empirical antibiotic use, bacterial epidemiology, and antimicrobial susceptibility for common antibiotic regimens among young infants with urinary tract infection (UTI), bacteremia, or bacterial meningitis. METHODS: We reviewed medical records from infants <90 days old presenting to 8 US children's hospitals with UTI, bacteremia, or meningitis. We used the Pediatric Health Information System database to identify cases and empirical antibiotic use and medical record review to determine infection, pathogen, and antimicrobial susceptibility patterns...
July 20, 2017: Hospital Pediatrics
https://www.readbyqxmd.com/read/28725560/haemophilus-influenzae-serotype-f-endocarditis-and-septic-arthritis
#9
Katerina Oikonomou, Basel Alhaddad, Kayla Kelly, Ravindra Rajmane, George Apergis
Haemophilus influenzae represents gram-negative coccobacilli which can cause endocarditis, meningitis, septicemia, pneumonia, septic arthritis. H.influenzae exists as encapsulated and unencapsulated (non-typeable) strains. Non-typeable H.influenzae are emerging pathogens especially in elderly population. We report a case of a 73 year old woman with bacteremia, endocarditis and septic arthritis due to H.influenzae serotype f. This case emphasizes the clinical features and the key elements of diagnosis and management of infections caused by non-typeable strains of H...
2017: IDCases
https://www.readbyqxmd.com/read/28724847/a-case-of-primary-bacterial-pericarditis-with-recurrent-cardiac-tamponade
#10
Takashi Yoshizane, Takeshi Yamamoto, Hiroshi Hayashi, Mitsunobu Kitamura, Hideki Miyachi, Yusuke Hosokawa, Koichi Akutsu, Wataru Shimizu
Cardiac tamponade is an important and potentially lethal complication of acute pericarditis. However, recurrence of cardiac tamponade is rare when it is treated appropriately. We present a 49-year-old man with bacterial pericarditis and recurrent cardiac tamponade, which was caused by the rupture of an upper part of the left atrium (LA). According to the autopsy findings, bacteremia from Staphylococcus aureus developed on a substrate of poorly controlled diabetes mellitus and spread to the pericardium via the blood...
2017: Journal of Nippon Medical School, Nippon Ika Daigaku Zasshi
https://www.readbyqxmd.com/read/28723791/arthritis-secondary-to-meningococcal-disease-a-case-series-of-7-patients
#11
Vanina Masson-Behar, Hervé Jacquier, Pascal Richette, Jean-Marc Ziza, Valérie Zeller, Christophe Rioux, Baptiste Coustet, Philippe Dieudé, Sébastien Ottaviani
Arthritis secondary to invasive meningococcemia is rare and has been described as a direct result of bacteremia or as immunoallergic-type arthritis, related to the immune complex. Only a few case series have been reported.This multicenter study aimed to describe the clinical characteristics and therapeutic outcomes of arthritis secondary to meningococcal infection.We performed a 5-year retrospective study. We included all patients with inflammatory joint symptoms and proven meningococcal disease defined by the identification of Neisseria meningitidis in blood, cerebrospinal fluid, or synovial fluid...
July 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28723479/infectious-complications-of-circumcision-and-their-prevention
#12
REVIEW
Itzhak Brook
CONTEXT: A growing body of evidence supports the health benefits of circumcision, but the occurrence of infectious complications is of concern. OBJECTIVE: To review literature presenting past data and studies of infectious complications of circumcision and their prevention. EVIDENCE ACQUISITION: A literature search was conducted of the Cochrane Library, Embase, Turning Research into Practice, PubMed, and Medline databases from their inception through June 25, 2015...
October 2016: European Urology Focus
https://www.readbyqxmd.com/read/28722617/case-report-disseminated-shewanella-algae-infection-with-meningoencephalitis-in-a-traveler-secondary-to-marine-injury-in-madagascar
#13
Caroline Brulliard, Nicolas Traversier, Jérôme Allyn, Christopher Schaeffer, Bruno Bouchet, Nicolas Allou
Marine microorganisms such as Shewanella spp., Vibrio spp., and Aeromonas spp. can cause sepsis secondary to a wound infection in the context of swimming. These microorganisms are most often susceptible to fluoroquinolones. Here, we report a unique case of Shewanella algae bacteremia associated with meningoencephalitis and disseminated via hematogenous spread secondary to a skin injury. The patient suffered the injury while swimming in saline water during a cruise holiday in Madagascar, and she was initially treated with amoxicillin...
June 12, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28720578/systematic-longitudinal-survey-of-invasive-escherichia-coli-in-england-demonstrates-a-stable-population-structure-only-transiently-disturbed-by-the-emergence-of-st131
#14
Teemu Kallonen, Hayley J Brodrick, Simon R Harris, Jukka Corander, Nicholas M Brown, Veronique Martin, Sharon J Peacock, Julian Parkhill
Escherichia coli associated with urinary tract infections and bacteremia has been intensively investigated, including recent work focusing on the virulent, globally disseminated, multidrug-resistant lineage ST131. To contextualize ST131 within the broader E. coli population associated with disease, we used genomics to analyze a systematic 11-yr hospital-based survey of E. coli associated with bacteremia using isolates collected from across England by the British Society for Antimicrobial Chemotherapy and from the Cambridge University Hospitals NHS Foundation Trust...
July 18, 2017: Genome Research
https://www.readbyqxmd.com/read/28719983/neonatal-lemierre-syndrome-youngest-reported-case-and-literature-review
#15
Blake S Raggio, Maria C Grant, Kimsey Rodriguez, Patrick J Cripe
A previously healthy 5-week-old female was admitted for sepsis secondary to methicillin-resistant Staphylococcus aureus (MRSA) bacteremia. After several days of hospitalization, she experienced acute decompensation in mental status despite having received targeted antibiotic therapy. Imaging revealed left peritonsillar/parapharyngeal space abscess, left venous thrombophlebitis of the internal jugular vein, and septic emboli of the lungs and brain consistent with Lemierre syndrome. Bedside needle aspiration of the parapharyngeal abscess confirmed MRSA involvement...
July 1, 2017: Clinical Pediatrics
https://www.readbyqxmd.com/read/28717145/acetylsalicylic-acid-differentially-limits-the-activation-and-expression-of-cell-death-markers-in-human-platelets-exposed-to-staphylococcus-aureus-strains
#16
Adrien Chabert, Pauline Damien, Paul O Verhoeven, Florence Grattard, Philippe Berthelot, Fabrice Zeni, Laurence Panicot-Dubois, Stéphane Robert, Françoise Dignat-George, Marie-Ange Eyraud, Bruno Pozzetto, Bernard Payrastre, Fabrice Cognasse, Olivier Garraud, Hind Hamzeh-Cognasse
Beyond their hemostatic functions, platelets alter their inflammatory response according to the bacterial stimulus. Staphylococcus aureus is associated with exacerbated inflammation and thrombocytopenia, which is associated with poor prognosis during sepsis. Acetylsalicylic acid and statins prevent platelet aggregation and decrease the mortality rate during sepsis. Therefore, we assessed whether these two molecules could reduce in vitro platelet activation and the inflammatory response to S. aureus. Platelets were exposed to clinical strains of S...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28717075/clinical-characteristics-of-bacteremia-caused-by-extended-spectrum-beta-lactamase-producing-escherichia-coli-at-a-tertiary-hospital
#17
Hiroki Namikawa, Koichi Yamada, Hiroki Fujimoto, Ken-Ichi Oinuma, Yoshihiro Tochino, Yasuhiko Takemoto, Yukihiro Kaneko, Taichi Shuto, Hiroshi Kakeya
Objective In recent years, infection caused by extended-spectrum beta-lactamase (ESBL)-producing organisms has become an important issue. However, comparative studies of the bacteremia caused by ESBL Enterobacteriaceae and non-ESBL Enterobacteriaceae are extremely rare in Japan. This study aimed to assess the risk factors and prognosis of patients with bacteremia due to ESBL Escherichia coli (E. coli). Methods The medical records of 31 patients with ESBL E. coli bacteremia and 98 patients with non-ESBL E. coli bacteremia who had been admitted to Osaka City University Hospital between January 2011 and June 2015 were retrospectively reviewed...
2017: Internal Medicine
https://www.readbyqxmd.com/read/28716670/nationwide-study-on-peripheral-venous-catheter-associated-bloodstream-infections-in-internal-medicine-departments
#18
María Guembe, María Jesús Pérez-Granda, José Antonio Capdevila, José Barberán, Blanca Pinilla, Pablo Martín-Rabadán, Emilio Bouza
BACKGROUND: The use of peripheral venous catheters (PVCs) has increased outside the intensive care unit, as have rates of peripheral venous catheter associated-bloodstream infection (PVC-BSI). The internal medicine department (IMD) is one of the main wards where PVCs are widely used. However, data on the incidence of PVC-BSI and its characteristics in the IMD are scarce. AIM: Our objective was to assess the incidence of PVC-BSI episodes detected in IMDs in Spain...
July 14, 2017: Journal of Hospital Infection
https://www.readbyqxmd.com/read/28716363/clinical-outcomes-and-prognostic-factors-of-patients-with-severe-influenza-receiving-intravenous-peramivir-salvage-therapy-in-intensive-care-units
#19
Ching-Yuan Yeh, Fu-Der Wang, Yu-Chung Chuang, Chia-Jui Yang, Shiang-Fen Huang, Wen-Sung Weng, Chun-Hsin Liaw, Wang-Huei Sheng
BACKGROUND: Few studies have investigated patients with severe influenza who receive intravenous peramivir for salvage therapy. METHODS: We retrospectively analyzed data from 71 patients with severe influenza who received intravenous peramivir therapy in the intensive care units of three medical centers between 2012 and 2016. All patients received oseltamivir or zanamivir before the administration of peramivir. RESULTS: A total of 44 men and 27 women with a median age of 55 years were enrolled...
June 26, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
https://www.readbyqxmd.com/read/28716359/predictors-of-polymyxin-b-treatment-failure-in-gram-negative-healthcare-associated-infections-among-critically-ill-patients
#20
Bahiah Ismail, Mohd Nazri Shafei, Azian Harun, Saedah Ali, Mahamarowi Omar, Zakuan Zainy Deris
BACKGROUND: With increasing prevalence and spread of multidrug resistant Gram-negative infections, parenteral polymyxins resurged in clinical practice. The primary aim of the study was to determine the predictors of treatment failure and in-hospital mortality among critically ill patients treated with polymyxin B. METHODS: Demographic data, underlying diseases, procedures and details on polymyxin B therapy were retrospectively analyzed in a cohort of 84 patients who received intravenous polymyxin B in an intensive care unit from 2010 to 2014...
June 29, 2017: Journal of Microbiology, Immunology, and Infection, Wei Mian Yu Gan Ran za Zhi
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