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https://www.readbyqxmd.com/read/29351663/mini-review-can-non-human-leucocyte-antigen-genes-determine-susceptibility-to-severe-dengue-syndromes
#1
Dorothy Ng, Aparna Ghosh, Mark Jit, Suranjith L Seneviratne
Dengue viral infections are endemic or epidemic in virtually all tropical countries. Among individuals infected with the dengue virus, severe dengue syndromes (i.e., dengue haemorrhagic fever and dengue shock syndromes) tend to affect only some and this may be due to a combination of host genetic susceptibility and viral factors. In this review article we analyse and discuss the present knowledge of non-human leucocyte antigen host genetic susceptibility to severe dengue syndromes. The relevance of genetic polymorphisms in the pathways of antigen recognition, uptake, processing and presentation, activation of interferon α responses, mast cell and complement activation and T cell activation and dengue disease severity has been reviewed and analysed...
January 17, 2018: Transactions of the Royal Society of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29349716/detection-of-bovine-carriers-of-leptospira-by-serological-bacteriological-and-molecular-tools
#2
Melissa H Pinna, Gabriel Martins, Ana Paula Loureiro, Walter Lilenbaum
Bovine leptospirosis is an important infectious disease that causes reproductive problems and economic risks, particularly in the tropics. The present study aimed to determine the extent of Leptospira infection among bovines on a slaughterhouse from Rio de Janeiro, Brazil via serological, bacteriological, and molecular tests. Two hundred eight bovines were examined in total, and we obtained 208 blood samples for serology, 198 urine samples collected via direct bladder puncture for polymerase chain reaction (PCR) and culture, 208 kidney samples (one from each animal) for PCR and culture, and 92 vaginal fluid samples from sterile swabs for PCR and culture...
January 18, 2018: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/29348555/novel-immunoinformatics-approaches-to-design-multi-epitope-subunit-vaccine-for-malaria-by-investigating-anopheles-salivary-protein
#3
Rajan Kumar Pandey, Tarun Kumar Bhatt, Vijay Kumar Prajapati
Malaria fever has been pervasive for quite a while in tropical developing regions causing high morbidity and mortality. The causal organism is a protozoan parasite of genus Plasmodium which spreads to the human host by the bite of hitherto infected female Anopheles mosquito. In the course of biting, a salivary protein of Anopheles helps in blood feeding behavior and having the ability to elicit the host immune response. This study represents a series of immunoinformatics approaches to design multi-epitope subunit vaccine using Anopheles mosquito salivary proteins...
January 18, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29346738/first-record-of-leucocytozoon-haemosporida-leucocytozoidae-in-amazonia-evidence-for-rarity-in-neotropical-lowlands-or-lack-of-sampling-for-this-parasite-genus
#4
Alan Fecchio, Patricia Silveira, Jason Weckstein, Janice Dispoto, Marina Anciães, Mariane Bosholn, Vasyl Tkach, Jeffrey Bell
Birds harbor an astonishing diversity of haemosporidian parasites belonging to the genera Haemoproteus, Leucocytozoon, and Plasmodium. Currently there are over 250 morphologically described avian haemosporidian species and 2828 unique lineages infecting virtually all avian clades and zoogeographic regions, except for Antarctica. Our report is based on PCR and microscopic screening of 1302 individual avian samples from Brazil to detect the underrepresented genus Leucocytozoon. This survey primarily focuses on passerine birds collected from Amazonia, Atlantic Rain Forest, and Pantanal...
January 18, 2018: Journal of Parasitology
https://www.readbyqxmd.com/read/29346440/geographical-distribution-of-soil-transmitted-helminths-and-the-effects-of-community-type-in-south-asia-and-south-east-asia-a-systematic-review
#5
Zachary A Silver, Saravanakumar P Kaliappan, Prasanna Samuel, Srinivasan Venugopal, Gagandeep Kang, Rajiv Sarkar, Sitara S R Ajjampur
BACKGROUND: Soil-transmitted helminth (STH) infections are among the most prevalent neglected tropical diseases (NTD) worldwide. Since the publication of the WHO road map to combat NTD in 2012, there has been a renewed commitment to control STH. In this study, we analysed the geographical distribution and effect of community type on prevalence of hookworm, Trichuris and Ascaris in south Asia and south east Asia. METHODOLOGY: We conducted a systematic review of open-access literature published in PubMed Central and the Global Atlas of Helminth Infection...
January 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29346412/a-comparative-analysis-of-preservation-techniques-for-the-optimal-molecular-detection-of-hookworm-dna-in-a-human-fecal-specimen
#6
Marina Papaiakovou, Nils Pilotte, Ben Baumer, Jessica Grant, Kristjana Asbjornsdottir, Fabian Schaer, Yan Hu, Raffi Aroian, Judd Walson, Steven A Williams
BACKGROUND: Proper collection and storage of fecal samples is necessary to guarantee the subsequent reliability of DNA-based soil-transmitted helminth diagnostic procedures. Previous research has examined various methods to preserve fecal samples for subsequent microscopic analysis or for subsequent determination of overall DNA yields obtained following DNA extraction. However, only limited research has focused on the preservation of soil-transmitted helminth DNA in stool samples stored at ambient temperature or maintained in a cold chain for extended periods of time...
January 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29346369/the-rise-of-neglected-tropical-diseases-in-the-new-texas
#7
REVIEW
Peter J Hotez
Within the last five years, the State of Texas has experienced either transmission or outbreaks of Ebola, chikungunya, West Nile, and Zika virus infections. Autochthonous transmission of neglected parasitic and bacterial diseases has also become increasingly reported. The rise of such emerging and neglected tropical diseases (NTDs) has not occurred by accident but instead reflects rapidly evolving changes and shifts in a "new" Texas beset by modern and globalizing forces that include rapid expansions in population together with urbanization and human migrations, altered transportation patterns, climate change, steeply declining vaccination rates, and a new paradigm of poverty known as "blue marble health...
January 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29342404/association-between-severity-of-liver-disease-frequency-of-helicobacter-pylori-infection-and-degree-of-gastric-lesion-in-egyptian-patients-with-hepatitis-b-virus-infection
#8
Amal A Mohamed, Amal A Elshimy, Abir O El Sadik, Elham Ezzat, Mona Nasar, Shereen S M Elshaer, Moataz M Sayed
The relationship between hepatitis B virus (HBV) infection, severity of liver disease, frequency of Helicobacter pylori infection, and degree of gastric lesions was not yet fully investigated in Egyptian patients. The present work was performed on 100 Egyptian patients with HBV from the National Hepatology and Tropical Medicine Institute and 70 healthy volunteers as control group. The participants were subjected to full medical history taking, clinical examination, and laboratory investigations. All patients were positive for HBV surface antigen (HBV sAg), HBV DNA, and negative for hepatitis C virus antibodies...
January 2018: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/29339224/emerging-souvenirs-clinical-presentation-of-the-returning-traveller-with-imported-arbovirus-infections-in-europe
#9
Isabella Eckerle, Violeta Briciu, Onder Ergonul, Mihaela Lupse, Anna Papa, Amanda Radulescu, Sotirios Tsiodras, Christine Tsitou, Christian Drosten, Véronique Nussenblatt, Chantal Reusken, Louise Sigfrid, Nick J Beeching
BACKGROUND: Arboviruses are an emerging group of viruses that are causing increasing health concerns globally, including in Europe. Clinical presentation usually consists of a non-specific febrile illness that may be accompanied by rash, arthralgia and arthritis and/or with neurological or haemorrhagic syndromes. The range of differential diagnoses of other infectious and non-infectious aetiologies is broad, presenting a challenge for physicians. While knowledge of the geographic distribution of pathogens and the current epidemiological situation, incubation periods, exposure risk factors and vaccination history can help guide the diagnostic approach, the non-specific and variable clinical presentation can delay final diagnosis...
January 12, 2018: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/29338001/modelling-the-large-scale-yellow-fever-outbreak-in-luanda-angola-and-the-impact-of-vaccination
#10
Shi Zhao, Lewi Stone, Daozhou Gao, Daihai He
BACKGROUND: Yellow fever (YF), transmitted via bites of infected mosquitoes, is a life-threatening viral disease endemic to tropical and subtropical regions of Africa and South America. YF has largely been controlled by widespread national vaccination campaigns. Nevertheless, between December 2015 and August 2016, YF resurged in Angola, quickly spread and becoming the largest YF outbreak for the last 30 years. Recently, YF resurged again in Brazil (December 2016). Thus, there is an urgent need to gain better understanding of the transmission pattern of YF...
January 16, 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29332596/synthesis-and-characterization-of-thiocarbohydrazones-and-their-inhibitory-potential-against-ignored-disease-leishmaniasis
#11
Nida Ghouri, Khalid Mohammed Khan, Arshia, M Iqbal Choudhary, Shahnaz Perveen
BACKGROUND: Leishmaniasis is a protozoan parasitic vector-borne disease which is endemic in 88 tropical countries. Infected sand fly is the main cause of this disease while, there are several vectors, parasites, and reservoirs involved in the transmission of this disease. Leishmania donovani, L. infantum, and L. chagasi are. common disease causing species, spread through sandflies. It is considered to be a focal disease having scattered foci. Leishmaniasis is a disease with a broad clinical spectrum...
January 14, 2018: Medicinal Chemistry
https://www.readbyqxmd.com/read/29332141/cultivable-fungi-present-in-antarctic-soils-taxonomy-phylogeny-diversity-and-bioprospecting-of-antiparasitic-and-herbicidal-metabolites
#12
Eldon C Q Gomes, Valéria M Godinho, Débora A S Silva, Maria T R de Paula, Gislaine A Vitoreli, Carlos L Zani, Tânia M A Alves, Policarpo A S Junior, Silvane M F Murta, Emerson C Barbosa, Jaquelline G Oliveira, Fabio S Oliveira, Camila R Carvalho, Mariana C Ferreira, Carlos A Rosa, Luiz H Rosa
Molecular biology techniques were used to identify 218 fungi from soil samples collected from four islands of Antarctica. These consisted of 22 taxa of 15 different genera belonging to the Zygomycota, Ascomycota, and Basidiomycota. Mortierella, Antarctomyces, Pseudogymnoascus, and Penicillium were the most frequently isolated genera and Penicillium tardochrysogenum, Penicillium verrucosus, Goffeauzyma gilvescens, and Mortierella sp. 2 the most abundant taxa. All fungal isolates were cultivated using solid-state fermentation to obtain their crude extracts...
January 13, 2018: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/29326780/cardiac-magnetic-resonance-of-myocardial-involvement-in-leptospirosis
#13
Onkar B Auti, Kanav Kansal, K V Shrikanth, Vimal Raj
Leptospirosis is a zoonotic infection caused by the Leptospira interrogans. Although it is endemic in tropical countries, global incidence has increased in several temperate and developed regions. Here, we present a cardiac magnetic resonance (CMR) and multidetector computer tomography (MDCT) chest features of active systemic leptospiral infection in a 19-year-old male. The MDCT appearances of lungs and CMR appearances of myocardium in icteric leptospirosis are described. Early diagnosis and prompt treatment is important to manage the cardiothoracic complications...
October 2017: Heart Views: the Official Journal of the Gulf Heart Association
https://www.readbyqxmd.com/read/29324800/hepcidin-deficiency-and-iron-deficiency-do-not-alter-tuberculosis-susceptibility-in-a-murine-m-tb-infection-model
#14
Rachel Harrington-Kandt, Elena Stylianou, Lucy A Eddowes, Pei Jin Lim, Lisa Stockdale, Nawamin Pinpathomrat, Naomi Bull, Janet Pasricha, Marta Ulaszewska, Yulia Beglov, Sophie Vaulont, Hal Drakesmith, Helen McShane
Tuberculosis (TB), caused by the macrophage-tropic pathogen Mycobacterium tuberculosis (M.tb) is a highly prevalent infectious disease. Since an immune correlate of protection or effective vaccine have yet to be found, continued research into host-pathogen interactions is important. Previous literature reports links between host iron status and disease outcome for many infections, including TB. For some extracellular bacteria, the iron regulatory hormone hepcidin is essential for protection against infection...
2018: PloS One
https://www.readbyqxmd.com/read/29324739/mansonella-perstans-microfilaremic-individuals-are-characterized-by-enhanced-type-2-helper-t-and-regulatory-t-and-b-cell-subsets-and-dampened-systemic-innate-and-adaptive-immune-responses
#15
Manuel Ritter, Winston Patrick Chounna Ndongmo, Abdel Jelil Njouendou, Nora Nganyewo Nghochuzie, Lucy Cho Nchang, Dizzle Bita Tayong, Kathrin Arndts, Norman Nausch, Marc Jacobsen, Samuel Wanji, Laura E Layland, Achim Hoerauf
The filarial nematode Mansonella perstans is endemic throughout Africa, northern South America and the Caribbean. Interestingly, M. perstans-infected individuals present no distinct clinical picture associated with certain pathology. Due to its relatively silent nature, research on this tropical disease has been neglected, especially M. perstans-driven immune responses. A hindrance in obtaining data on M. perstans-specific responses has been the inability to obtain adult worms since their habitats in serous cavities are difficult to access...
January 11, 2018: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/29321330/glycosyl-phosphatidylinositol-anchored-anti-hiv-env-single-chain-variable-fragments-interfere-with-hiv-1-env-processing-and-viral-infectivity
#16
Anisha Misra, Emile Gleeson, Weiming Wang, Chaobaihui Ye, Paul Zhou, Jason T Kimata
In previous studies, we demonstrated that single-chain variable fragments (scFv) from anti-HIV Env monoclonal antibodies act as entry inhibitors when tethered to the surface of target cells by a glycosyl-phosphitidylinositol (GPI) anchor. Interestingly, even if a virus escapes inhibition at entry, its replication is ultimately controlled. We hypothesized that in addition to functioning as entry inhibitors, anti-HIV GPI-scFvs may also interact with Env in an infected cell, thereby interfering with infectivity of newly produced virions...
January 10, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29321321/functional-analysis-of-the-dengue-virus-genome-using-an-insertional-mutagenesis-screen
#17
Jeffrey W Perry, Yanhua Chen, Elizabeth Speliotes, Andrew W Tai
In the last few decades, dengue virus, an arbovirus, has spread to over 120 countries. Although a vaccine has been approved in some countries, limitations on its effectiveness, and a lack of effective antiviral treatments reinforce the need for additional research. The functions of several viral nonstructural proteins are essentially unknown. To better understand the functions of these proteins and thus dengue virus pathogenesis, we embarked on a genome wide transposon mutagenesis screen with Next Generation Sequencing to determine sites in the viral genome that tolerate 15 nucleotide insertions...
January 10, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29321303/infection-and-replication-of-influenza-virus-at-the-ocular-surface
#18
Hannah M Creager, Amrita Kumar, Hui Zeng, Taronna R Maines, Terrence M Tumpey, Jessica A Belser
Though influenza viruses typically cause respiratory tract disease, some viruses, particularly those with an H7 hemagglutinin, have been isolated from the eyes of conjunctivitis cases. Previous work has shown that isolates of multiple subtypes from both ocular and respiratory infections are capable of replication in human ex vivo ocular tissues and corneal or conjunctival cell monolayers, leaving the determinants of ocular tropism unclear. Here, we evaluated the effect of several variables on tropism for ocular cells cultured in vitro and examined the potential effect of the tear film on viral infectivity...
January 10, 2018: Journal of Virology
https://www.readbyqxmd.com/read/29320544/diversity-patterns-leishmania-dna-detection-and-bloodmeal-identification-of-phlebotominae-sand-flies-in-villages-in-northern-colombia
#19
Camila González, Cielo León, Andrea Paz, Marla López, Gisell Molina, Diana Toro, Mario Ortiz, Juan Manuel Cordovez, María Claudia Atencia, Germán Aguilera, Catalina Tovar
Leishmaniases are neglected tropical diseases exhibiting complex transmission cycles due to the number of parasite species circulating, sand fly species acting as vectors and infected mammals, including humans, which are defined in the New World as accidental hosts. However, current transmission scenarios are changing, and the disease is no longer exclusively related to forested areas but urban transmission foci occur, involving some species of domestic animals as suspected reservoirs. The aim of this study was to determine the transmission cycles in urban environments by evaluating sand fly diversity, detection of Leishmania DNA, and bloodmeal sources through intra and peridomestic collections...
2018: PloS One
https://www.readbyqxmd.com/read/29318997/screening-of-returned-travelers
#20
Orçun Zorbozan, Ayşegül Ünver, Adnan Yüksel Gürüz
Travel-related health problems have been reported in 22-64% of travelers to developing countries. Approximately 8% of these patients are moderately ill and are referred to health facilities. Post-travel infections are usually symptomatic in the early stages, but they may last for up to months or even years, depending on the incubation period. It has been reported that it is not necessary to have extensive knowledge on tropical diseases to be able to make a clinical evaluation after the trip. All post-travel consultations should be performed by physicians and should include travel-related illness identification, timely medical intervention, and, if necessary, referral to a senior hospital...
December 2017: Türkiye Parazitolojii Dergisi
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