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Immunocompromised infections

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https://www.readbyqxmd.com/read/28445957/peripheral-kynurenine-tryptophan-ratio-is-not-a-reliable-marker-of-systemic-indoleamine-2-3-dioxygenase-a-lesson-drawn-from-patients-on-hemodialysis
#1
Yuanhan Chen, Zhen Xie, Chenggen Xiao, Min Zhang, Zhilian Li, Jianteng Xie, Yusheng Zhang, Xingchen Zhao, Pengfei Zeng, Liyi Mo, Xinling Liang, Wei Shi
Indoleamine 2,3-dioxygenase (IDO) has emerged as a pivotal enzyme for mediating immune tolerance. Because IDO metabolizes tryptophan into kynurenine, the plasma kynurenine/tryptophan (Kyn/Trp) ratio has been widely used as a marker of systemic IDO. Here, we evaluated the clinical value of using the plasma Kyn/Trp ratio to estimate cell-mediated immune responses to tuberculin skin testing and risk of new bacterial infection. We also compared the Kyn/Trp ratio to a novel IDO marker, the IDO median fluorescence index (MFI) of peripheral blood mononuclear cells, which was determined by flow cytometry...
April 11, 2017: Oncotarget
https://www.readbyqxmd.com/read/28445159/invasive-pulmonary-aspergillosis-in-patients-with-chronic-obstructive-pulmonary-disease-a-case-report-and-review-of-the-literature
#2
Zhiyao Bao, Hong Chen, Min Zhou, Guochao Shi, Qingyun Li, Huanying Wan
Invasive pulmonary aspergillosis (IPA) is an infection that often occurs in immunocompromised patients and has a high mortality rate. In recent years, the reported incidence of IPA in the context of chronic obstructive pulmonary disease (COPD) has seemingly increased. The combination of factors such as long-term corticosteroid use, increasing rate of bacterial exacerbations over time, lung immune imbalance, and malnutrition are responsible for the emergence of IPA in COPD patients. A diagnosis of IPA in COPD patients is difficult to make, which explains the delay in antifungal therapy and the high mortality rate...
April 8, 2017: Oncotarget
https://www.readbyqxmd.com/read/28443070/crystal-structure-of-glyceraldehyde-3-phosphate-dehydrogenase-from-the-gram-positive-bacterial-pathogen-a-vaginae-an-immunoevasive-factor-that-interacts-with-the-human-c5a-anaphylatoxin
#3
Javier Querol-García, Francisco J Fernández, Ana V Marin, Sara Gómez, Daniel Fullà, Cecilia Melchor-Tafur, Virginia Franco-Hidalgo, Sebastián Albertí, Jordi Juanhuix, Santiago Rodríguez de Córdoba, José R Regueiro, M Cristina Vega
The Gram-positive anaerobic human pathogenic bacterium Atopobium vaginae causes most diagnosed cases of bacterial vaginosis as well as opportunistic infections in immunocompromised patients. In addition to its well-established role in carbohydrate metabolism, D-glyceraldehyde-3-phosphate dehydrogenase (GAPDH) from Streptococcus pyogenes and S. pneumoniae have been reported to act as extracellular virulence factors during streptococcal infections. Here, we report the crystal structure of GAPDH from A. vaginae (AvGAPDH) at 2...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28442806/study-of-clinical-profile-of-herpes-zoster-in-human-immunodeficiency-virus-positive-and-negative-patients-at-a-rural-based-tertiary-care-center-gujarat
#4
Rita V Vora, Gopikrishnan Anjaneyan, Rahul Krishna S Kota, Abhishek P Pilani, Nilofar G Diwan, Nidhi N Patel
BACKGROUND: Herpes zoster usually presents with typically grouped vesicles on erythematous base involving single dermatome with self-limiting nature in immunocompetent individuals while it may present in extensive form involving multiple dermatomes involvement or disseminated form in immunocompromised, especially in human immunodeficiency virus (HIV). AIMS AND OBJECTIVES: The aim of this study was to study the prevalence of HIV in patients of herpes zoster, to compare the clinical presentation of herpes zoster in HIV-infected and noninfected patient...
January 2017: Indian Journal of Sexually Transmitted Diseases
https://www.readbyqxmd.com/read/28442545/peroxisome-proliferator-activated-receptor-%C3%AE-agonists-attenuate-biofilm-formation-by-pseudomonas-aeruginosa
#5
Brahmchetna Bedi, Nicholas M Maurice, Vincent T Ciavatta, K Sabrina Lynn, Zhihong Yuan, Samuel A Molina, Myungsoo Joo, William R Tyor, Joanna B Goldberg, Michael H Koval, C Michael Hart, Ruxana T Sadikot
Pseudomonas aeruginosa is a significant contributor to recalcitrant multidrug- resistant infections, especially in immunocompromised and hospitalized patients. The pathogenic profile of P. aeruginosa is related to its ability to secrete a variety of virulence factors and to promote biofilm formation. Quorum sensing (QS) is a mechanism wherein P. aeruginosa secretes small diffusible molecules, specifically acyl homo serine lactones, such as N-(3-oxo-dodecanoyl)-l-homoserine lactone (3O-C12-HSL), that promote biofilm formation and virulence via interbacterial communication...
April 25, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28440395/microrna-mediated-inflammatory-responses-induced-by-cryptococcus-neoformans-are-dependent-on-the-nf-%C3%AE%C2%BAb-pathway-in-human-monocytes
#6
Hong Chen, Yi Jin, Huan Chen, Ningxin Liao, Yan Wang, Jianghan Chen
Cryptococcosis is a significant invasive fungal infection with noteworthy morbidity and mortality that is usually caused by either Cryptococcus neoformans (C. neoformans) or Cryptococcus gattii (C. gattii). Epidemiological studies have indicated that C. neoformans are more often reported in immunocompromised and immunocompetent patients. It has been well established that the cytokine profile of the host markedly affects the outcome of cryptococcal disease, and the negative regulators of microRNAs(miRs or miRNAs) are critically important for immunomodulation...
April 12, 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28440301/the-environmental-yeast-cryptococcus-liquefaciens-produces-capsular-and-secreted-polysaccharides-with-similar-pathogenic-properties-to-those-of-c-neoformans
#7
Glauber R de S Araújo, Gustavo J C Freitas, Fernanda L Fonseca, Paulo Emilio C Leite, Gustavo Miranda Rocha, Wanderley de Souza, Daniel A Santos, Susana Frases
Invasive fungal infections, including cryptococcosis, are a growing threat to immunocompromised patients. Although Cryptococcus neoformans and Cryptococcus gattii are the main agents of human cryptococcosis, opportunistic infections by environmental species, such as C. liquefaciens, have been observed recently. The main Cryptococcus virulence factor is the production and secretion of polysaccharides (PS). Previously, we showed that both species produce PS of similar composition. Here, we examined the ultrastructure and biological activity of capsular and secreted PS from C...
April 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28439794/the-effectiveness-of-voriconazole-in-therapy-of-candida-glabrata-s-biofilms-oral-infections-and-its-influence-on-the-matrix-composition-and-gene-expression
#8
Célia F Rodrigues, Bruna Gonçalves, Maria Elisa Rodrigues, Sónia Silva, Joana Azeredo, Mariana Henriques
Candida glabrata is one of most prevalent yeast in fungal infections, especially in immunocompromised patients. Its azole resistance results in a low therapeutic response, particularly when associated with biofilms. The main goal of this work was to study the effectiveness of voriconazole (Vcz) against C. glabrata biofilms oral pathologies, as esophageal or oropharyngeal candidiasis. Antifungal susceptibilities were determined in pre-formed 24-h-biofilms and ERG genes expression was determined by qRT-PCR. Protein quantification was performed using BCA(®) Kit, carbohydrate was estimated according to the Dubois assay and β-1,3 glucans concentration were determined using Glucatell(®) kit...
April 24, 2017: Mycopathologia
https://www.readbyqxmd.com/read/28438507/cardiothoracic-transplant-recipient-mycoplasma-hominis-an-uncommon-infection-with-probable-donor-transmission
#9
Rahul Sampath, Robin Patel, Scott A Cunningham, Sana Arif, Richard C Daly, Andrew D Badley, Mark E Wylam
The role of infection with Mycoplasma hominis following cardiothoracic organ transplantation and its source of transmission have not been well-defined. Here, we identify and describe infection with M. hominis in patients following cardiothoracic organ transplantation after reviewing all cardiothoracic transplantations performed at our center between 1998 and July 2015. We found seven previously unreported cases of M. hominis culture positive infection all of whom presented with pleuritis, surgical site infection, and/or mediastinitis...
April 19, 2017: EBioMedicine
https://www.readbyqxmd.com/read/28438210/specific-and-quantitative-detection-of-human-polyomaviruses-bkpyv-and-jcpyv-in-the-healthy-pakistani-population
#10
Iqra Hussain, Fareeda Tasneem, Muhammed Umer, Ayesha Pervaiz, Muslim Raza, Muhammad Imran Arshad, Naveed Shahzad
BACKGROUND: The BK Polyomavirus (BKPyV) and JC polyomavirus (JCPyV) infections are widespread in human population and have been associated with severe kidney and brain disorders, respectively. The viruses remain latent primarily in reno-urinary tract, reactivating only in case of a compromised immune system. The seroepidemiology and molecular prevalence of BKPyV and JCPyV have been widely studied both in healthy and immunocompromised patients worldwide. However, data regarding the prevalence of these viruses in the immunocompetent or apparently healthy Pakistani population is lacking...
April 24, 2017: Virology Journal
https://www.readbyqxmd.com/read/28436616/reduced-infectivity-of-waterborne-viable-but-nonculturable-helicobacter-pylori-strain-ss1-in-mice
#11
Kevin F Boehnke, Kathryn A Eaton, Clinton Fontaine, Rebecca Brewster, Jianfeng Wu, Joseph N S Eisenberg, Manuel Valdivieso, Laurence H Baker, Chuanwu Xi
BACKGROUND: Helicobacter pylori infection has been consistently associated with lack of access to clean water and proper sanitation, but no studies have demonstrated that the transmission of viable but nonculturable (VBNC) H. pylori can occur from drinking contaminated water. In this study, we used a laboratory mouse model to test whether waterborne VBNCH. pylori could cause gastric infection. MATERIALS AND METHODS: We performed five mouse experiments to assess the infectivity of VBNCH...
April 24, 2017: Helicobacter
https://www.readbyqxmd.com/read/28435886/discovery-of-a-novel-antifungal-agent-in-the-pathogen-box
#12
François L Mayer, James W Kronstad
Human fungal pathogens cause over 2 million infections per year and are major drivers of morbidity and mortality. Cryptococcus neoformans and Candida albicans are two of the most common fungal pathogens of humans, together accounting for a staggering 1.4 million infections annually, with very high mortality rates. Patients with dysfunctional immune systems, such as individuals with HIV/AIDS, are particularly susceptible to fungal infections. Unfortunately, relatively few antifungal drugs are currently available and fungi frequently develop resistance, further complicating treatment approaches...
March 2017: MSphere
https://www.readbyqxmd.com/read/28434229/the-cell-cycle-dependent-kinase-cdk9-is-a-post-exposure-drug-target-against-human-adenoviruses
#13
Vibhu Prasad, Maarit Suomalainen, Silvio Hemmi, Urs F Greber
Human adenoviruses (HAdVs) infect respiratory, gastrointestinal and urinary tracts, and give rise to eye infections and epidemic keratoconjunctivitis (EKC). They persist in lymphoid tissue, and cause morbidity and mortality in immunocompromised people. Treatments with significant post-exposure efficacy are not available. Here, we report that inhibition of the cell cycle-dependent kinase 9 (Cdk9) by RNA-interference, or the compound Flavopiridol blocked infections with HAdV-C2/5, EKC-causing HAdV-D8/37, and progeny formation in human corneal epithelial and cancer cells...
April 24, 2017: ACS Infectious Diseases
https://www.readbyqxmd.com/read/28434050/prevalence-of-toxoplasma-gondii-infection-in-hiv-infected-patients-and-food-animals-and-direct-genotyping-of-t-gondii-isolates-southern-ghana
#14
Faustina Pappoe, Weisheng Cheng, Lin Wang, Yuanling Li, Dorcas Obiri-Yeboah, Samuel Victor Nuvor, Henock Ambachew, Xiaodong Hu, Qingli Luo, Deyong Chu, Yuanhong Xu, Jilong Shen
Toxoplasma gondii is of public health and veterinary importance causing severe diseases in immunocompromised individuals including HIV/AIDS patients and in congenital cases and animals. There is limited information on the epidemiology of T. gondii infection in humans, particularly HIV patients and food animals and the parasite genotypes in Ghana. A total of 394 HIV-infected patients from three hospitals were screened for T. gondii anti-IgG and IgM using ELISA. DNAs from blood samples of seropositve participants and 95 brain tissues of food animals were PCR assayed to detect Toxoplasma gra6...
April 22, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28432932/surveillance-of-vittaforma-corneae-in-hot-springs-by-a-small-volume-procedure
#15
Jung-Sheng Chen, Tsui-Kang Hsu, Bing-Mu Hsu, Tung-Yi Huang, Yu-Li Huang, Men-Fang Shaio, Dar-Der Ji
Vittaforma corneae is an obligate intracellular fungus and can cause human ocular microsporidiosis. Although accumulating reports of V. corneae causing keratoconjunctivitis in both healthy and immunocompromised persons have been published, little is known about the organism's occurrence in aquatic environments. Limitations in detection sensitivity have meant a large sampling volume is required to detect the pathogen up to now, which is problematic. A recent study in Taiwan has shown that some individuals suffering from microsporidial keratitis (MK) were infected after exposure to the pathogen at a hot spring...
April 19, 2017: Water Research
https://www.readbyqxmd.com/read/28431915/synergistic-anticandidal-activity-of-menthol-in-combination-with-itraconazole-and-nystatin-against-clinical-candida-glabrata-and-candida-krusei-isolates
#16
Aghil Sharifzadeh, Ali Reza Khosravi, Hojjatollah Shokri, Paria Samadi Tari
BACKGROUND: Candida glabrata (C. glabrata) and C. krusei are now emerging as serious hospital acquired infections in immunocompromised patients. Menthol, a terpenic compound, has been reported to have antifungal activity. OBJECTIVES: The aim of this study was to investigate the effect of menthol in combination with itraconazole or nystatin against C. glabrata and C. krusei isolates. METHODS: The effects of menthol along with itraconazole and nystatin, were evaluated by the Clinical Laboratory Standards Institute (CLSI) M44-A and CLSI M27-A3 methods...
April 19, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28429890/prevalence-of-the-reversed-halo-sign-in-neutropenic-patients-compared-with-non-neutropenic-patients-data-from-a-single-centre-study-involving-27-patients-with-pulmonary-mucormycosis-2003-2016
#17
Jessie Bourcier, Pierre-Marie Heudes, Florent Morio, Thomas Gastinne, Patrice Chevallier, Fanny Rialland-Battisti, Claire Garandeau, Isabelle Danner-Boucher, Patrice Le Pape, Eric Frampas, Philippe Moreau, Claire Defrance, Pierre Peterlin
Pulmonary mucormycosis (PM) is a life-threatening infection and the diagnosis can be challenging. The objective was to retrospectively explore the value of the RHS in our cohort of 27 patients with mucormycosis and its relation to neutropenia. This was a retrospective study including all patients with a diagnosis of probable or proven invasive PM according to the 2008 EORTC/MSG criteria between September 2003 to April 2016. Fisher's exact test and Mann-Whitney test, with a P-value statistically significant under ...
April 21, 2017: Mycoses
https://www.readbyqxmd.com/read/28429575/recovery-from-talaromyces-marneffei-involving-the-kidney-in-a-renal-transplant-recipient-a-case-report-and-literature-review
#18
Juan Peng, Zhiyong Chen, Ruiming Cai, Xianen Huang, Liying Lin, Weixiang Liang, Zhongtang Xiong, Juan Chen, Hui Chen, Yuexin Yang, Shaoyan Liu, Qingping Jiang
Talaromyces marneffei is an emerging opportunistic infection among immunocompromised patients. We observe the first native case of disseminated T. marneffei involving the kidney in a renal transplant recipient in mainland China. We describe the comprehensive clinical course, and ultrasound imaging of renal transplant biopsy, pathologic images, and electron microscopy observation of the biopsy specimen, highlighting the relevance of biopsy findings and the blood culture. We also focus on the treatment and good outcome of the patient...
April 21, 2017: Transplant Infectious Disease: An Official Journal of the Transplantation Society
https://www.readbyqxmd.com/read/28425927/hepatitis-e-virus-genotypes-and-evolution-emergence-of-camel-hepatitis-e-variants
#19
REVIEW
Siddharth Sridhar, Jade L L Teng, Tsz-Ho Chiu, Susanna K P Lau, Patrick C Y Woo
Hepatitis E virus (HEV) is a major cause of viral hepatitis globally. Zoonotic HEV is an important cause of chronic hepatitis in immunocompromised patients. The rapid identification of novel HEV variants and accumulating sequence information has prompted significant changes in taxonomy of the family Hepeviridae. This family includes two genera: Orthohepevirus, which infects terrestrial vertebrates, and Piscihepevirus, which infects fish. Within Orthohepevirus, there are four species, A-D, with widely differing host range...
April 20, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28425766/update-in-the-treatment-of-non-influenza-respiratory-virus-infection-in-solid-organ-transplant-recipients
#20
Shellee A Grim, Gail E Reid, Nina M Clark
Despite the improved outcomes in solid organ transplantation with regard to prevention of rejection and increased patient and graft survival, infection remains a common cause of morbidity and mortality. Respiratory viruses are a frequent and potentially serious cause of infection after solid organ transplantation. Furthermore, clinical manifestations of respiratory virus infection (RVI) may be more severe and unusual in solid organ transplant recipients (SOTRs) compared with the non-immunocompromised population...
April 20, 2017: Expert Opinion on Pharmacotherapy
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