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infections in the immunocompromised host

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https://www.readbyqxmd.com/read/28719288/evaluation-of-the-protective-effect-of-deoxyribonucleic-acid-vaccines-encoding-granule-antigen-2-and-5-against-acute-toxoplasmosis-in-balb-c-mice
#1
Xiao Teng Ching, Mun Yik Fong, Yee Ling Lau
AbstractToxoplasma gondii infects a broad range of warm-blooded hosts, including humans. Important clinical manifestations include encephalitis in immunocompromised patients as well as miscarriage and fetal damage during early pregnancy. Toxoplasma gondii dense granule antigen 2 and 5 (GRA2 and GRA5) are essential for parasitophorous vacuole development of the parasite. To evaluate the potential of GRA2 and GRA5 as recombinant DNA vaccine candidates, these antigens were cloned into eukaryotic expression vector (pcDNA 3...
June 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28717096/disseminated-mycobacterium-scrofulaceum-infection-in-an-immunocompetent-host
#2
Yu Takemoto, Hirokazu Tokuyasu, Tomoyuki Ikeuchi, Hirofumi Nakazaki, Satoru Nakamatsu, Suguru Kakite, Keiichi Yamasaki
A 56-year-old woman, without any immunocompromising diseases, was referred to our hospital because of a recurrence of pyogenic spondylitis. Computed tomography revealed multiple osteolytic changes in the whole body. Vertebral magnetic resonance imaging revealed osteomyelitis and spondylitis. Mycobacterium scrofulaceum was detected in sputum cultures, in abscesses from the right knee, and in a subcutaneous forehead abscess. Therefore, the patient was diagnosed with disseminated Mycobacterium scrofulaceum infection...
2017: Internal Medicine
https://www.readbyqxmd.com/read/28714333/-borrelia-miyamotoi-a-recently-identified-human-pathogenic-tick-borne-relapsing-fever-spirochete
#3
Sándor Szekeres, András Lakos, Gábor Földvári
Borrelia miyamotoi is a recently described relapsing fever spirochete transmitted by ticks of the Ixodes ricinus complex. This pathogen is different from Borrelia burgdorferi sensu lato (the Lyme borreliosis spirochetes) in its epidemiology, ecology and also genetics. Over 50 patients have been described worldwide with Borrelia miyamotoi disease, and three immunocompromised patients were reported with neurological symptoms. Our knowledge about Borrelia miyamotoi infection in ticks and its distribution in different habitats and also the mechanism of the infection is limited...
July 2017: Orvosi Hetilap
https://www.readbyqxmd.com/read/28710648/clinical-associated-characteristics-and-microbiological-features-of-bloodstream-nontyphoidal-salmonella-infection-in-adult-patients-receiving-allogeneic-hematopoietic-stem-cell-transplantation
#4
Po-Shen Ko, Yao-Chung Liu, Hao-Yuan Wang, Chia-Yun Wu, Nai-Wen Fan, Chia-Jen Liu, Yuan-Bin Yu, Liang-Tsai Hsiao, Tzeon-Jye Chiou, Cheng-Hwai Tzeng, Jin-Hwang Liu, Jyh-Pyng Gau
Bloodstream nontyphoidal salmonella (NTS) infection is rare, but its associated characteristics and microbiological features in immunocompromised patients are worth paying attention to, particularly for those receiving allogeneic hematopoietic stem cell transplantation (SCT). No studies so far have analyzed post-transplant bloodstream NTS infection. Therefore, we reviewed 423 adult patients undergoing allogeneic hematopoietic SCT from 2003 to 2014. Nine out of four hundred twenty-three patients (2.13%) developed post-transplant bloodstream NTS infection, including two patients who had subsequent or combined metastatic infections...
July 15, 2017: Annals of Hematology
https://www.readbyqxmd.com/read/28710242/pseudomonas-aeruginosa-as-an-unusual-cause-of-cavitating-lung-lesion
#5
Justin D Salciccioli, Hannah Woodcock, Mathina Darmalingam
A 31-year-old woman with systemic lupus erythematosus presented to the emergency department with cough for 1 week. Chest radiograph demonstrated cavitating lesion in the right upper zone with surrounding ground-glass change. Blood culture results from the day of hospital presentation grew Pseudomonas aeruginosa Sputum sample and pleural fluid grew P. aeruginosa and were negative for acid-fast bacilli. P. aeruginosa is a rare cause of cavitating lung lesion and has been associated with immunocompromised hosts...
July 14, 2017: BMJ Case Reports
https://www.readbyqxmd.com/read/28707783/aggressive-necrotizing-pseudomonal-sinonasal-infections
#6
Edward C Kuan, Bobby A Tajudeen, Kevin C Welch, Rakesh K Chandra, Ben J Glasgow, Jeffrey D Suh
BACKGROUND: Pseudomonas aeruginosa is a gram-negative bacterium frequently implicated in recalcitrant sinonasal infections, especially in immunocompromised hosts. We report 6 cases of rapidly progressive pseudomonal acute rhinosinusitis producing tissue necrosis and, in certain cases, cranial nerve palsies. METHODS: Retrospective review of 6 patients with aggressive necrotizing sinonasal infections treated at 4 tertiary academic medical centers with sinonasal cultures growing P...
July 14, 2017: International Forum of Allergy & Rhinology
https://www.readbyqxmd.com/read/28705685/-fungal-sinusitis
#7
REVIEW
E Lafont, C Aguilar, P Vironneau, R Kania, A Alanio, S Poirée, O Lortholary, F Lanternier
Although sinusitis affects about 20 % of the population, fungal sinusitis is rare. Aspergillus sp. are most frequently implicated. Fungal sinusitis represents a wide spectrum of disorders, including acute or chronic and invasive or non-invasive forms. Invasive fungal sinusitis may develop in an immunocompromised or diabetic patient, whereas non-invasive fungal sinusitis should be considered in a chronic situation, resistant to antibiotics in immunocompetent patients. Allergic fungal sinusitis is related to hypersensitivity of the host to the fungus...
July 10, 2017: Revue des Maladies Respiratoires
https://www.readbyqxmd.com/read/28704490/the-synthetic-killer-peptide-kp-impairs-candida-albicans-biofilm-in-vitro
#8
Simona Paulone, Andrea Ardizzoni, Arianna Tavanti, Serena Piccinelli, Cosmeri Rizzato, Antonella Lupetti, Bruna Colombari, Eva Pericolini, Luciano Polonelli, Walter Magliani, Stefania Conti, Brunella Posteraro, Claudio Cermelli, Elisabetta Blasi, Samuele Peppoloni
Candida albicans is a commensal organism, commonly inhabiting mucosal surfaces of healthy individuals, as a part of the resident microbiota. However, in susceptible hosts, especially hospitalized and/or immunocompromised patients, it may cause a wide range of infections. The presence of abiotic substrates, such as central venous or urinary catheters, provides an additional niche for Candida attachment and persistence, particularly via biofilm development. Furthermore, Candida biofilm is poorly susceptible to most antifungals, including azoles...
2017: PloS One
https://www.readbyqxmd.com/read/28702856/dynamics-of-torque-teno-virus-viremia-could-predict-risk-of-complications-after-allogeneic-hematopoietic-stem-cell-transplantation
#9
Ramona Gilles, Marco Herling, Udo Holtick, Eva Heger, Sabine Awerkiew, Irina Fish, Konstantin Höller, Saleta Sierra, Elena Knops, Rolf Kaiser, Christof Scheid, Veronica Di Cristanziano
Allogeneic hematopoietic stem cell transplantation (allo-HSCT) is an established treatment option for several hematological diseases. However, the first year post-transplantation is often complicated by infections and graft-versus-host disease (GVHD). Improvements in immunological monitoring could reduce such post-transplant complications. Torque Teno virus (TTV), a chronically persisting DNA virus, is reported to be a marker for immune function in immunocompromised patients. In the present study, the TTV kinetics were analyzed to investigate the potential role of TTV viremia as immune-competence read-out after allo-HSCT...
July 12, 2017: Medical Microbiology and Immunology
https://www.readbyqxmd.com/read/28702025/cellular-and-molecular-defects-underlying-invasive-fungal-infections-revelations-from-endemic-mycoses
#10
REVIEW
Pamela P Lee, Yu-Lung Lau
The global burden of fungal diseases has been increasing, as a result of the expanding number of susceptible individuals including people living with human immunodeficiency virus (HIV), hematopoietic stem cell or organ transplant recipients, patients with malignancies or immunological conditions receiving immunosuppressive treatment, premature neonates, and the elderly. Opportunistic fungal pathogens such as Aspergillus, Candida, Cryptococcus, Rhizopus, and Pneumocystis jiroveci are distributed worldwide and constitute the majority of invasive fungal infections (IFIs)...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28692662/potential-malignant-transformation-in-the-gastric-mucosa-of-immunodeficient-mice-with-persistent-mycoplasma-penetrans-infection
#11
Shuyan Cao, Dandan Shen, Yadong Wang, Linxi Li, Liping Zhou, Yuxue Wang
Mycoplasma infection has been reported in immunocompromised cancer patients; nevertheless, it is not clear if persistent Mycoplasma infection could facilitate the proliferation of cancer cells in immunocompromised organisms. The aim of this study was to examine the relationship between persistent Mycoplasma infection and malignant transformation in an immunodeficient host model. Immunodeficient mouse model was established using cyclophosphamide and mice gastric mucosal cells were infected with Mycoplasma penetrans (Mpe)...
2017: PloS One
https://www.readbyqxmd.com/read/28684133/histopathology-of-fungal-diseases-of-the-lung
#12
REVIEW
Anja C Roden, Audrey N Schuetz
Fungal pneumonias can be a diagnostic problem. However, their recognition is important as they can pose a significant health risk, especially in the immunocompromised host. While many of these infections are accompanied by necrotizing or non-necrotizing granulomas, some might be characterized by cellular interstitial pneumonia, intra-alveolar frothy material or only minimal inflammatory change. Much of the tissue reaction is dependent on the immune status of the patient and the type of fungal organism. While many of the fungi can be identified in tissue, especially if using histochemical stains such as Grocott's Methenamine Silver (GMS) stain and/or Periodic Acid Schiff (PAS) stain, in some cases, these stains are negative and the organisms can only be identified in cultures or using special techniques such as PCR or fungal serology...
June 14, 2017: Seminars in Diagnostic Pathology
https://www.readbyqxmd.com/read/28679983/a-case-of-cytomegalovirus-infection-with-splenic-infarction-and-an-esophageal-ulcer-in-an-immunocompetent-adult
#13
Yoshiaki Shimizu, Takuya Komura, Takuya Seike, Ryotaro Nakai, Hitoshi Omura, Takashi Kagaya, Hajime Ohta, Satomi Kasashima, Atsuhiro Kawashima, Masashi Unoura
BACKGROUND: Recently, morbidities due to primary cytomegalovirus (CMV) infection have increased in young Japanese adults because of decreased anti-CMV antibodies in them. CMV infections are typically resolved naturally in immunocompetent individuals, and complications rarely occur. Here we present the case of an immunocompetent adult with CMV infection complicated by splenic infarctions and an esophageal ulcer. CASE REPORT: A 37-year-old male complaining of a prolonged fever and liver injury was admitted to hospital for a closed examination...
2017: Nihon Shokakibyo Gakkai Zasshi, the Japanese Journal of Gastro-enterology
https://www.readbyqxmd.com/read/28670986/-periprosthetic-joint-infection-caused-by-rhodococcus-equi-case-report
#14
Imre Sallai, Nóra Péterfy, Mohammad Sanatkhani, Zoltán Bejek, Imre Antal, Gyula Prinz, Katalin Kristóf, Gábor Skaliczki
Rhodococcus equi is a rare pathogen in humans causing infections mostly in immunocompromised hosts. We present the first case of periprosthetic joint infection caused by Rhodococcus equi. An 88-year-old male patient was referred to our clinic with a history of fever and right hip pain. The patient had multiple hip surgeries including total joint arthroplasty and revision for aseptic loosening on the right side. He was immunocompetent, but his additional medical history was remarkable for diabetes mellitus, diabetic nephropathy and stroke with hemiplegia resulting in immobilization...
July 2017: Orvosi Hetilap
https://www.readbyqxmd.com/read/28659882/dendritic-cells-primed-with-paracoccidioides-brasiliensis-peptide-p10-are-therapeutic-in-immunosuppressed-mice-with-paracoccidioidomycosis
#15
Leandro B R Silva, Lucas S Dias, Glauce M G Rittner, Julián E Muñoz, Ana C O Souza, Joshua D Nosanchuk, Luiz R Travassos, Carlos P Taborda
Paracoccidioidomycosis (PCM) is an endemic systemic mycosis in Latin America, with the highest prevalence in Brazil, Colombia, and Venezuela. Fungi of the Paracoccidioides genus are etiologic agents of the disease. The 15 amino acid peptide P10 is derived from gp43, the main diagnostic antigen of Paracoccidioides brasiliensis. We previously reported that P10-pulsed dendritic cells (DCs) induce a protective response against P. brasiliensis. Presently, dexamethasone-treated BALB/c mice were intratracheally infected with P...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28658594/targeting-protein-localization-for-anti-infective-therapy
#16
J Andrew Alspaugh
Invasive fungal infections are devastating complications of immunocompromised patients. These infections are notoriously difficult to treat given the surprising degree of physiological similarity between fungi and the infected mammalian host. To explore novel targets for antifungal therapy, investigators have studied enzymes involved in the post-translational modification of highly conserved signaling proteins such as the Ras-like GTPases. These modifications are often required for protein localization and function...
June 28, 2017: Virulence
https://www.readbyqxmd.com/read/28658592/dectin-1-plays-an-important-role-in-host-defense-against-systemic-candida-glabrata-infection
#17
Si Min Chen, Shen Hui, Teng Zhang, Xin Huang, Xiao Qi Liu, Shi Yu Guo, Jing Jun Zhao, Chun Fang Wang, Lan Yan, Guo Tong Xu, Yuan Ying Jiang, Mao Mao An
Candida glabrata is the second most common pathogen of severe candidiasis in immunocompromised hosts, following C. albicans. Although C. glabrata and C. albicans belong to the same genus, they are phylogenetically distinct. C-type lectin receptors (CLRs), acting as pattern-recognition receptors (PRRs), play critical roles in host defense against C. albicans infections. However, our understanding of the specific roles of CLRs in host defense against C. glabrata is limited. Here, we explored the potential roles of the C-type lectins Dectin-1 and Dectin-2 in host defense against C...
June 28, 2017: Virulence
https://www.readbyqxmd.com/read/28658148/graft-versus-host-disease-after-kidney-transplantation-a-case-report-and-literature-review
#18
REVIEW
Yanhua Guo, Shouyang Ding, Hui Guo, Shenqiu Li, Xia Lu, Zhishui Chen, Zhonghua Klaus Chen, Changsheng Ming, Nianqiao Gong
INTRODUCTION: Acute graft-versus-host-disease (GVHD) in kidney recipients is extremely rare. Knowledge about its clinical manifestations, diagnosis, treatment, and prognosis is limited and needs to be increased. CLINICAL FINDINGS: One male kidney transplant recipient developed diarrhea and suffered kidney function damage. Primarily diagnosed with acute rejection, he was given methylprednisolone (MP) bolus treatment. Meanwhile, intravenous immunoglobulin (IVIG) and decreased immunosuppressive agents were applied for the corresponding infection...
June 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28653624/parallel-evolution-of-influenza-across-multiple-spatiotemporal-scales
#19
Katherine S Xue, Terry Stevens-Ayers, Angela P Campbell, Janet A Englund, Steven A Pergam, Michael Boeckh, Jesse D Bloom
Viral variants that arise in the global influenza population begin as de novo mutations in single infected hosts, but the evolutionary dynamics that transform within-host variation to global genetic diversity are poorly understood. Here, we demonstrate that influenza evolution within infected humans recapitulates many evolutionary dynamics observed at the global scale. We deep-sequence longitudinal samples from four immunocompromised patients with long-term H3N2 influenza infections. We find parallel evolution across three scales: within individual patients, in different patients in our study, and in the global influenza population...
June 27, 2017: ELife
https://www.readbyqxmd.com/read/28653591/mechanism-of-dexamethasone-in-the-context-of-toxoplasma-gondii-infection
#20
Jing Zhang, Xin Qin, Y U Zhu, Shuang Zhang, Xue-Wei Zhang, H E Lu
Toxoplasmosis is a serious zoonoses disease and opportunistic, and can be life-threatening. Dexamethasone (DEX) is widely used in the clinic for treatment of inflammatory and autoimmune diseases. However, long-term use of DEX is often easy to lead to acute toxoplasmosis in patients, and the potential molecular mechanism is still not very clear. The aims of this study were to investigate the effect of DEX on proliferation of Toxoplasma and its molecular mechanisms, and to establish the corresponding control measures...
June 27, 2017: Parasitology
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