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İnfection immunology

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https://www.readbyqxmd.com/read/29457584/immunological-stability-of-clostridium-difficile-toxins-in-clinical-specimens
#1
Donna M Schora, Lance R Peterson, Elena A Usacheva
OBJECTIVE The impact of storage on stability and detection of Clostridium difficile toxins in feces is poorly understood. The objective of this study was to investigate the immunological stability of C. difficile toxins in clinical stool specimens under different storage conditions by evaluating this stability using toxin detection by enzyme immunoassay (EIA). METHODS Stool specimens positive for C. difficile infection (CDI) by quantitative polymerase chain reaction (qPCR) were used for EIA testing with the C...
February 19, 2018: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/29456824/a-brief-review-on-features-of-falciparum-malaria-during-pregnancy
#2
Alexandre Manirakiza, Eugène Serdouma, Richard Norbert Ngbalé, Sandrine Moussa, Samuel Gondjé, Rock Mbetid Degana, Gislain Géraud Banthas Bata, Jean Methode Moyen, Jean Delmont, Gérard Grésenguet, Abdoulaye Sepou
Malaria in pregnancy is a serious public health problem in tropical areas. Frequently, the placenta is infected by accumulation of Plasmodium falciparum- infected erythrocytes in the intervillous space. Falciparum malaria acts during pregnancy by a range of mechanisms, and chronic or repeated infection and co-infections have insidious effects. The susceptibility of pregnant women to malaria is due to both immunological and humoral changes. Until a malaria vaccine becomes available, the deleterious effects of malaria in pregnancy can be avoided by protection against infection and prompt treatment with safe, effective antimalarial agents; however, concurrent infections such as with HIV and helminths during pregnancy are jeopardizing malaria control in sub-Saharan Africa...
December 31, 2017: Journal of Public Health in Africa
https://www.readbyqxmd.com/read/29456247/b-cells-are-the-predominant-mediators-of-early-systemic-viral-dissemination-during-rectal-lcmv-infection
#3
Martin Trapecar, Shahzada Khan, Benjamin L Cohn, Frank Wu, Shomyseh Sanjabi
Determining the magnitude of local immune response during mucosal exposure to viral pathogens is critical to understanding the mechanism of viral pathogenesis. We previously showed that vaginal inoculation of lymphocytic choriomeningitis virus (LCMV) fails to induce a robust innate immune response in the lower female reproductive tract (FRT), allowing high titer viral replication and a delay in T-cell-mediated viral control. Despite this immunological delay, LCMV replication remained confined mainly to the FRT and the draining iliac lymph node...
February 19, 2018: Mucosal Immunology
https://www.readbyqxmd.com/read/29454786/rhinovirus-respiratory-tract-infection-in-hospitalized-adult-patients-is-associated-with-t-h-2-response-irrespective-of-asthma
#4
Kelvin K W To, Lu Lu, Carol H Y Fong, Alan K L Wu, Ka-Yi Mok, Cyril C Y Yip, Yi-Hong Ke, Kong-Hung Sze, Susanna K P Lau, Ivan F N Hung, Kwok-Yung Yuen
OBJECTIVES: We assessed the immunological response of hospitalized adult patients with rhinovirus infection, including critically-ill patients. METHODS: The differential white blood cell (WBC) count and the levels of 29 plasma cytokines/chemokines were compared between 50 adult hospitalized patients with rhinovirus infection and 100 age-matched controls with influenza virus infection. RESULTS: The demographics and comorbidities were similar between rhinovirus and influenza patients, but severe disease was more common for the rhinovirus cohort...
February 15, 2018: Journal of Infection
https://www.readbyqxmd.com/read/29454785/lymphoid-tissue-inducer-a-divergent-member-of-the-ilc-family
#5
REVIEW
Chao Zhong, Mingzhu Zheng, Jinfang Zhu
Innate lymphoid cells (ILCs) that are capable of producing effector cytokines reminiscent of CD4+ T helper (Th) cells during infections and tissue inflammations have drawn much attention in the immunology field in recent years. Within the ILCs, the lymphoid tissue inducer (LTi) cells that play a critical role in lymphoid organogenesis were identified long before the establishment of the ILC concept. LTi cells, developed and functioning mainly at the fetal stage, and LTi-like cells, presumably generated during the adulthood, are regarded as a subset of type 3 ILCs (ILC3s) because they express the ILC3 lineage-defining transcription factor RORγt, and like other ILC3s, can produce an ILC3 signature cytokine IL-22 and initiate protective immune responses against extracellular bacteria...
February 13, 2018: Cytokine & Growth Factor Reviews
https://www.readbyqxmd.com/read/29454654/invasive-pulmonary-aspergillosis-and-influenza-co-infection-in-immunocompetent-hosts-case-reports-and-review-of-the-literature
#6
Melisa M Shah, Eric I Hsiao, Carl M Kirsch, Amit Gohil, Supriya Narasimhan, David A Stevens
Invasive pulmonary aspergillosis (IPA) is classically considered an illness of severely immunocompromised patients with limited host defenses. However, IPA has been reported in immunocompetent but critically ill patients. This report describes two fatal cases of pathologically confirmed IPA in patients with influenza in the intensive care unit. One patient had influenza B infection, whereas the other had influenza A H1N1. Both patients died despite broad-spectrum antimicrobials, mechanical ventilation, and vasopressor support...
February 2, 2018: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/29454646/alteration-of-ccr6-cd95-cd4-na%C3%A3-ve-t-cells-in-hiv-1-infected-patients-implication-for-clinical-practice
#7
Hong Sun, Wenqing Geng, Hualu Cui, Guoxin Liang, Yajing Fu, Zining Zhang, Yongjun Jiang, Haibo Ding, Junjie Xu, Hong Shang
The profound deficiency of Th17 cells contributes to HIV disease progression. The mechanisms of their perturbation remain unclear. Recently, CCR6+ CD95+ CD4+ naïve T cells (CCR6+ CD95+ CD4+ TNA ), identified as pre-committed Th17 precursors, were recognized as a subpopulation of CD4+ T cells with stem cell properties. Following phenotypical identification, we evaluated their level in patients during chronic HIV infection and following antiretroviral therapy (ART) using flow cytometry. The levels of CCR6+ CD95+ CD4+ TNA were decreased during chronic HIV infection and correlated with CD4+ T cell counts...
February 10, 2018: Cellular Immunology
https://www.readbyqxmd.com/read/29451987/association-of-adiponectin-leptin-ratio-with-carbohydrate-and-lipid-metabolism-parameters-in-hiv-infected-patients-during-antiretroviral-therapy
#8
Catalin Tiliscan, Victoria Arama, Raluca Mihailescu, Daniela Munteanu, Diana Gabriela Iacob, Cristina Popescu, Remulus Catana, Anca Negru, Alina Lobodan, Stefan Sorin Arama
BACKGROUND: Adiponectin and leptin are adipose tissue hormones that regulate important lipid and glucose metabolic pathways. Our objective was to evaluate the interplay of these hormones described by the adiponectin/leptin ratio (ALR) in correlation to lipid and carbohydrate metabolism parameters in nondiabetic HIV-infected patients during antiretroviral therapy (ART). MATERIALS AND METHODS: We enrolled consecutive nondiabetic patients with confirmed HIV infection, undergoing stable ART regimens for at least six months...
February 16, 2018: Endocrine Research
https://www.readbyqxmd.com/read/29451870/long-term-efficacy-and-safety-of-rilpivirine-plus-abacavir-and-lamivudine-in-hiv-1-infected-patients-with-undetectable-viral-load
#9
Nadia Galizzi, Laura Galli, Andrea Poli, Nicola Gianotti, Elisabetta Carini, Alba Bigoloni, Giuseppe Tambussi, Silvia Nozza, Adriano Lazzarin, Antonella Castagna, Daniela Mancusi, Roberta Termini
INTRODUCTION: A regimen with rilpivirine (RPV), abacavir (ABC) and lamivudine (3TC) is simple and may allow the sparing of tenofovir and protease inhibitors. However, data on use of this combination as a strategy of switch are limited. Aims of the study were to assess the long-term efficacy and safety of this regimen. METHODS: Retrospective study on HIV-1 infected patients followed at the Infectious Disease Department of the San Raffaele Scientific Institute, HBsAg-negative, HLA B5701-negative, with no documented resistance to RPV, ABC and 3TC, with HIV-RNA<50 copies/mL who started RPV plus ABC/3TC from March 2013 to September 2015...
2018: PloS One
https://www.readbyqxmd.com/read/29449856/efficient-detection-of-long-dsrna-in-vitro-and-in-vivo-using-the-dsrna-binding-domain-from-fhv-b2-protein
#10
Baptiste Monsion, Marco Incarbone, Kamal Hleibieh, Vianney Poignavent, Ahmed Ghannam, Patrice Dunoyer, Laurent Daeffler, Jens Tilsner, Christophe Ritzenthaler
Double-stranded RNA (dsRNA) plays essential functions in many biological processes, including the activation of innate immune responses and RNA interference. dsRNA also represents the genetic entity of some viruses and is a hallmark of infections by positive-sense single-stranded RNA viruses. Methods for detecting dsRNA rely essentially on immunological approaches and their use is often limited to in vitro applications, although recent developments have allowed the visualization of dsRNA in vivo . Here, we report the sensitive and rapid detection of long dsRNA both in vitro and in vivo using the dsRNA binding domain of the B2 protein from Flock house virus...
2018: Frontiers in Plant Science
https://www.readbyqxmd.com/read/29448846/are-infectious-diseases-and-microbiology-new-fields-for-thermal-therapy-research
#11
Deniz Gazel, Mehmet Yılmaz
Antimicrobial chemotherapy and surgery are classical methods for treating infectious diseases. However, there is a need for alternative methods to cure infections caused by antibiotic-resistant pathogens, recurrent or chronic infections, and unreachable local infections in which the use of drugs or surgery is anatomically and physically restricted. Several microorganisms are known to be sensitive to mild hyperthermia, and this sensitivity is one of the potential benefits proposed for the host during an episode of fever...
February 15, 2018: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/29447335/condition-dependent-generation-of-aquaporin-4-antibodies-from-circulating-b-cells-in-neuromyelitis-optica
#12
Robert Wilson, Mateusz Makuch, Anne-Kathrin Kienzler, James Varley, Jennifer Taylor, Mark Woodhall, Jacqueline Palace, M Isabel Leite, Patrick Waters, Sarosh R Irani
Autoantibodies to aquaporin-4 (AQP4) are pathogenic in neuromyelitis optica spectrum disorder (NMOSD). However, it is not known which B cells are the major contributors to circulating AQP4 antibodies nor which conditions promote their generation. Our experiments showed CD19+CD27++CD38++ circulating ex vivo antibody-secreting cells did not produce AQP4 antibodies under several culture conditions. To question whether other cells in circulation were capable of AQP4 antibody production, B cells were differentiated into antibody-secreting cells in vitro...
February 13, 2018: Brain: a Journal of Neurology
https://www.readbyqxmd.com/read/29447242/a-novel-ligand-on-astrocytes-interacts-with-natural-cytotoxicity-receptor-nkp44-regulating-immune-response-mediated-by-nk-cells
#13
Kelly E Bowen, Stephen O Mathew, Kathleen Borgmann, Anuja Ghorpade, Porunelloor A Mathew
NK cells play important role in immunity against pathogens and cancer. NK cell functions are regulated by inhibitory and activating receptors binding corresponding ligands on the surface of target cells. NK cells were shown to be recruited to the CNS following several pathological conditions. NK cells could impact CNS physiology by killing glial cells and by secreting IFN-γ. Astrocytes are intimately involved in immunological and inflammatory events occurring in the CNS and reactive astrogliosis is a key feature in HIV-associated neurocognitive disorders...
2018: PloS One
https://www.readbyqxmd.com/read/29447199/short-term-repeated-hrv-16-exposure-results-in-an-attenuated-immune-response-in-vivo-in-humans
#14
Rebecca M Koch, Matthijs Kox, Corné van den Kieboom, Gerben Ferwerda, Jelle Gerretsen, Sandra Ten Bruggencate, Johannes G van der Hoeven, Marien I de Jonge, Peter Pickkers
INTRODUCTION: Naturally, development of adaptive immunity following HRV infection affects the immune response. However, it is currently unclear whether or not HRV re-exposure within a short time frame leads to an altered innate immune response. The "experimental cold model" is used to investigate the pathogenesis of HRV infection and allows us to investigate the effects of repeated exposure on both local and systemic innate immunity. METHODS: 40 healthy male and female (1:1) subjects were nasally inoculated with HRV-16 or placebo...
2018: PloS One
https://www.readbyqxmd.com/read/29445885/the-interplay-of-lipids-lipoproteins-and-immunity-in-atherosclerosis
#15
REVIEW
Angela Pirillo, Fabrizia Bonacina, Giuseppe Danilo Norata, Alberico Luigi Catapano
PURPOSE OF REVIEW: Atherosclerosis is an inflammatory disorder of the arterial wall, in which several players contribute to the onset and progression of the disease. Besides the well-established role of lipids, specifically cholesterol, and immune cell activation, new insights on the molecular mechanisms underlying the atherogenic process have emerged. RECENT FINDINGS: Meta-inflammation, a condition of low-grade immune response caused by metabolic dysregulation, immunological memory of innate immune cells (referred to as "trained immunity"), cholesterol homeostasis in dendritic cells, and immunometabolism, i...
February 14, 2018: Current Atherosclerosis Reports
https://www.readbyqxmd.com/read/29445452/exploiting-immune-cell-metabolic-machinery-for-functional-hiv-cure-and-the-prevention-of-inflammaging
#16
REVIEW
Clovis S Palmer, Riya Palchaudhuri, Hassan Albargy, Mohamed Abdel-Mohsen, Suzanne M Crowe
An emerging paradigm in immunology suggests that metabolic reprogramming and immune cell activation and functions are intricately linked. Viral infections, such as HIV infection, as well as cancer force immune cells to undergo major metabolic challenges. Cells must divert energy resources in order to mount an effective immune response. However, the fact that immune cells adopt specific metabolic programs to provide host defense against intracellular pathogens and how this metabolic shift impacts immune cell functions and the natural course of diseases have only recently been appreciated...
2018: F1000Research
https://www.readbyqxmd.com/read/29444185/humoral-and-cell-mediated-immune-responses-after-a-booster-dose-of-hbv-vaccine-in-hiv-infected-children-adolescents-and-young-adults
#17
Vania Giacomet, Michela Masetti, Pilar Nannini, Federica Forlanini, Mario Clerici, Gian Vincenzo Zuccotti, Daria Trabattoni
OBJECTIVE: HBV vaccine induces protective antibodies only in 23-56% of HIV-infected children. The aim of our study is to evaluate the immunologic effects of a booster dose of HBV vaccine in HIV-infected youth. DESIGN: 53 young HIV-infected patients in whom HBV vaccination did not elicit protective Ab titers were enrolled. All patients were on ART with optimal immunological and viral response. METHOD: All patients received a booster dose of HBV vaccine (HBVAXPRO 10 μg i...
2018: PloS One
https://www.readbyqxmd.com/read/29443856/complications-in-tube-thoracostomy-systematic-review-and-meta-analysis
#18
Matthew C Hernandez, Moustafah El Khatib, Larry Prokop, Martin D Zielinski, Johnathon M Aho
BACKGROUND: Tube thoracostomy (TT) complications and their reported rates are highly variable (1-40%) and inconsistently classified. Consistent TT complication classification must be applied to compare reported literature to standardize TT placement. We aim to determine the overall TT related complication rates in patients receiving TT for traumatic indications utilizing uniform definitions. METHOD: Systematic review and meta-analysis was performed assessing TT related complications...
February 14, 2018: Journal of Trauma and Acute Care Surgery
https://www.readbyqxmd.com/read/29440397/sex-bias-in-mhc-i-associated-shaping-of-the-adaptive-immune-system
#19
Tilman Schneider-Hohendorf, Dennis Görlich, Paula Savola, Tiina Kelkka, Satu Mustjoki, Catharina C Gross, Geoffrey C Owens, Luisa Klotz, Klaus Dornmair, Heinz Wiendl, Nicholas Schwab
HLA associations, T cell receptor (TCR) repertoire bias, and sex bias have independently been shown for many diseases. While some immunological differences between the sexes have been described, they do not fully explain bias in men toward many infections/cancers, and toward women in autoimmunity. Next-generation TCR variable beta chain (TCRBV) immunosequencing of 824 individuals was evaluated in a multiparametric analysis including HLA-A -B/MHC class I background, TCRBV usage, sex, age, ethnicity, and TCRBV selection/expansion dynamics...
February 12, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29439842/zinc-supplementation-plays-a-crucial-role-in-t-helper-9-differentiation-in-allogeneic-immune-reactions-and-non-activated-t-cells
#20
Martina Maywald, Fudi Wang, Lothar Rink
T helper (Th) 9 cells play a critical role in immune-mediated diseases, including allergic airway inflammation, autoimmune diseases, and cancer development. Thus, the promotion or suppression of Th9 cell differentiation, transcriptional control, and function is very important for a healthy immune system. Interestingly, T cell maturation, differentiation and function are highly dependent on the individuals' zinc status. This is especially seen in zinc deficient individuals as in the elderly population often suffering of autoimmunity and increased incidence of infections...
February 6, 2018: Journal of Trace Elements in Medicine and Biology
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