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PLoS Neglected Tropical Diseases

Naouel Eddaikra, Khatima Ait-Oudhia, Ihcen Kherrachi, Bruno Oury, Farida Moulti-Mati, Razika Benikhlef, Zoubir Harrat, Denis Sereno
BACKGROUND: In Algeria, the treatment of visceral and cutaneous leishmanioses (VL and CL) has been and continues to be based on antimony-containing drugs. It is suspected that high drug selective pressure might favor the emergence of chemoresistant parasites. Although treatment failure is frequently reported during antimonial therapy of both CL and VL, antimonial resistance has never been thoroughly investigated in Algeria. Determining the level of antimonial susceptibility, amongst Leishmania transmitted in Algeria, is of great importance for the development of public health policies...
March 21, 2018: PLoS Neglected Tropical Diseases
Kangkang Liu, Yanshan Zhu, Yao Xia, Yingtao Zhang, Xiaodong Huang, Jiawei Huang, Enqiong Nie, Qinlong Jing, Guoling Wang, Zhicong Yang, Wenbiao Hu, Jiahai Lu
BACKGROUND: This study aimed to investigate the spatiotemporal clustering and socio-environmental factors associated with dengue fever (DF) incidence rates at street level in Guangzhou City, China. METHODS: Spatiotemporal scan technique was applied to identify the high risk region of DF. Multiple regression model was used to identify the socio-environmental factors associated with DF infection. A Poisson regression model was employed to examine the spatiotemporal patterns in the spread of DF...
March 21, 2018: PLoS Neglected Tropical Diseases
Joseph R Fauver, James Weger-Lucarelli, Lawrence S Fakoli, Kpehe Bolay, Fatorma K Bolay, Joseph W Diclaro, Doug E Brackney, Brian D Foy, Mark D Stenglein, Gregory D Ebel
BACKGROUND: Novel surveillance strategies are needed to detect the rapid and continuous emergence of infectious disease agents. Ideally, new sampling strategies should be simple to implement, technologically uncomplicated, and applicable to areas where emergence events are known to occur. To this end, xenosurveillance is a technique that makes use of blood collected by hematophagous arthropods to monitor and identify vertebrate pathogens. Mosquitoes are largely ubiquitous animals that often exist in sizable populations...
March 21, 2018: PLoS Neglected Tropical Diseases
Mary Freire de Carvalho, Marco A N Vigilato, Julio A Pompei, Felipe Rocha, Alexandra Vokaty, Baldomero Molina Flores, Ottorino Cosivi, Victor J Del Rio Vilas
Through national efforts and regional cooperation under the umbrella of the Regional Program for the Elimination of Rabies, dog and human rabies have decreased significantly in Latin America and Caribbean (LAC) countries over the last three decades. To achieve this decline, LAC countries had to develop national plans, and consolidate capabilities such as regular mass dog vaccination, opportune post-exposure prophylaxis and sensitive surveillance. This paper presents longitudinal data for 21 LAC countries on dog vaccination, PEP and rabies surveillance collected from the biannual regional meeting for rabies directors from 1998-2014 and from the Regional Epidemiologic Surveillance System for Rabies (SIRVERA)...
March 20, 2018: PLoS Neglected Tropical Diseases
Caetano Souto-Maior, Gabriel Sylvestre, Fernando Braga Stehling Dias, M Gabriela M Gomes, Rafael Maciel-de-Freitas
Infection is a complex and dynamic process involving a population of invading microbes, the host and its responses, aimed at controlling the situation. Depending on the purpose and level of organization, infection at the organism level can be described by a process as simple as a coin toss, or as complex as a multi-factorial dynamic model; the former, for instance, may be adequate as a component of a population model, while the latter is necessary for a thorough description of the process beginning with a challenge with an infectious inoculum up to establishment or elimination of the pathogen...
March 20, 2018: PLoS Neglected Tropical Diseases
Theerapon Sukmark, Nuttha Lumlertgul, Sadudee Peerapornratana, Kamol Khositrangsikun, Kriang Tungsanga, Visith Sitprija, Nattachai Srisawat
BACKGROUND: Leptospirosis is one of the most important zoonosis in the tropics. Currently, specific laboratory diagnostic test for leptospirosis such as polymerase chain reaction (PCR) or direct culture cannot be applied at the primary care setting especially in the resource- limited countries. Therefore, clinical presentation and laboratory examination are still the primary diagnostic tools for leptospirosis. OBJECTIVES: To detect clinical factors for predicting leptospirosis in suspected cases, and to create a clinical prediction score (THAI-LEPTO) that is practical and easy to use in general practice while awaiting laboratory results...
March 19, 2018: PLoS Neglected Tropical Diseases
Jane Oliver, Erandi Malliya Wadu, Nevil Pierse, Nicole J Moreland, Deborah A Williamson, Michael G Baker
OBJECTIVE: Antibiotic treatment of Group A Streptococcus (GAS) pharyngitis is important in acute rheumatic fever (ARF) prevention, however clinical guidelines for prescription vary. GAS carriers with acute viral infections may receive antibiotics unnecessarily. This review assessed the prevalence of GAS pharyngitis and carriage in different settings. METHODS: A random-effects meta-analysis was performed. Prevalence estimates for GAS+ve pharyngitis, serologically-confirmed GAS pharyngitis and asymptomatic pharyngeal carriage were generated...
March 19, 2018: PLoS Neglected Tropical Diseases
Daniel P O'Brien, N Deborah Friedman, Anthony McDonald, Peter Callan, Andrew Hughes, Aaron Walton, Eugene Athan
BACKGROUND: Healing times following treatment with antibiotics, and factors that influence healing, have not been reported in Australian patients with Mycobacterium ulcerans. METHODOLOGY/PRINCIPAL FINDINGS: Healing times were determined for all M. ulcerans cases treated by a single physician with antibiotics at Barwon Health, Victoria, from 1/1/13-31/12/16. Lesions were categorised by induration size: category A ≤ 400mm2, Category B 401-1600mm2 and Category C ≥1601mm2...
March 19, 2018: PLoS Neglected Tropical Diseases
Michael J Loftus, Jason A Trubiano, Ee Laine Tay, Caroline J Lavender, Maria Globan, Janet A M Fyfe, Paul D R Johnson
BACKGROUND: Buruli ulcer (BU) is a geographically-restricted infection caused by Mycobacterium ulcerans; contact with an endemic region is the primary risk factor for disease acquisition. Globally, efforts to estimate the incubation period of BU are often hindered as most patients reside permanently in endemic areas. However, in the south-eastern Australian state of Victoria, a significant proportion of people who acquire BU are visitors to endemic regions. During a sustained outbreak of BU on the Bellarine peninsula we estimated a mean incubation period of 4...
March 19, 2018: PLoS Neglected Tropical Diseases
Stephane Olindo, Severine Jeannin, Martine Saint-Vil, Aissatou Signate, Mireille Edimonana-Kaptue, Julien Joux, Harold Merle, Pascale Richard, Samuel Granjeaud, Philippe Cabre, Didier Smadja, Raymond Cesaire, Agnes Lezin
BACKGROUND: Human T-lymphotropic virus type 1 (HTLV-1) has been discovered in 1980 and has been linked to tropical spastic paraparesis (HAM/TSP) in 1985 in Martinique. There is no data on HAM/TSP incidence trends. We report, in the present work, the temporal trends incidence of HAM/TSP in Martinique over 25 years. METHODS: Martinique is a Caribbean French West Indies island deserved by a unique Neurology Department involved in HAM/TSP diagnosis and management. A registry has been set up since 1986 and patients diagnosed for a HAM/TSP were prospectively registered...
March 19, 2018: PLoS Neglected Tropical Diseases
Bruce Y Lee, Sarah M Bartsch, Laura Skrip, Daniel L Hertenstein, Cameron M Avelis, Martial Ndeffo-Mbah, Carla Tilchin, Eric O Dumonteil, Alison Galvani
BACKGROUND: The 2020 Sustainable Development goals call for 100% certified interruption or control of the three main forms of Chagas disease transmission in Latin America. However, how much will achieving these goals to varying degrees control Chagas disease; what is the potential impact of missing these goals and if they are achieved, what may be left? METHODS: We developed a compartmental simulation model that represents the triatomine, human host, and non-human host populations and vector-borne, congenital, and transfusional T...
March 19, 2018: PLoS Neglected Tropical Diseases
Donal Bisanzio, Felipe Dzul-Manzanilla, Hector Gomez-Dantés, Norma Pavia-Ruz, Thomas J Hladish, Audrey Lenhart, Jorge Palacio-Vargas, Jesus F González Roldan, Fabian Correa-Morales, Gustavo Sánchez-Tejeda, Pablo Kuri Morales, Pablo Manrique-Saide, Ira M Longini, M Elizabeth Halloran, Gonzalo M Vazquez-Prokopec
Response to Zika virus (ZIKV) invasion in Brazil lagged a year from its estimated February 2014 introduction, and was triggered by the occurrence of severe congenital malformations. Dengue (DENV) and chikungunya (CHIKV) invasions tend to show similar response lags. We analyzed geo-coded symptomatic case reports from the city of Merida, Mexico, with the goal of assessing the utility of historical DENV data to infer CHIKV and ZIKV introduction and propagation. About 42% of the 40,028 DENV cases reported during 2008-2015 clustered in 27% of the city, and these clustering areas were where the first CHIKV and ZIKV cases were reported in 2015 and 2016, respectively...
March 15, 2018: PLoS Neglected Tropical Diseases
Nan Shwe Nwe Htun, Peter Odermatt, Ivan Müller, Peiling Yap, Peter Steinmann, Christian Schindler, Markus Gerber, Rosa Du Randt, Cheryl Walter, Uwe Pühse, Jürg Utzinger, Nicole Probst-Hensch
BACKGROUND: Low- and middle-income countries are facing a dual disease burden with infectious diseases (e.g., gastrointestinal tract infections) and non-communicable diseases (e.g., diabetes) being common. For instance, chronic parasite infections lead to altered immune regulatory networks, anemia, malnutrition, and diarrhea with an associated shift in the gut microbiome. These can all be pathways of potential relevance for insulin resistance and diabetes. The aim of this study was to investigate the association between common gastrointestinal tract infections and glycemia in children from non-fee paying schools in South Africa...
March 15, 2018: PLoS Neglected Tropical Diseases
Vanesa Alende-Castro, Cristina Macía-Rodríguez, Ignacio Novo-Veleiro, Xana García-Fernández, Mercedes Treviño-Castellano, Sergio Rodríguez-Fernández, Arturo González-Quintela
BACKGROUND: Forms of presentation of Q fever vary widely across Spain, with differences between the north and south. In the absence of reported case series from Galicia (north-west Spain), this study sought to describe a Q-fever case series in this region for the first time, and conduct a systematic review to analyse all available data on the disease in Spain. METHODS: Patients with positive serum antibodies to Coxiella burnetii from a single institution over a 5-year period (January 2011-December 2015) were included...
March 15, 2018: PLoS Neglected Tropical Diseases
Azael Che-Mendoza, Anuar Medina-Barreiro, Edgar Koyoc-Cardeña, Valentín Uc-Puc, Yamili Contreras-Perera, Josué Herrera-Bojórquez, Felipe Dzul-Manzanilla, Fabian Correa-Morales, Hilary Ranson, Audrey Lenhart, Philip J McCall, Axel Kroeger, Gonzalo Vazquez-Prokopec, Pablo Manrique-Saide
BACKGROUND: There is a need for effective methods to control Aedes aegypti and prevent the transmission of dengue, chikungunya, yellow fever and Zika viruses. Insecticide treated screening (ITS) is a promising approach, particularly as it targets adult mosquitoes to reduce human-mosquito contact. METHODOLOGY/PRINCIPAL FINDINGS: A cluster-randomised controlled trial evaluated the entomological efficacy of ITS based intervention, which consisted of the installation of pyrethroid-impregnated long-lasting insecticide-treated netting material fixed as framed screens on external doors and windows...
March 15, 2018: PLoS Neglected Tropical Diseases
Andrea Cristine Koishi, Andréia Akemi Suzukawa, Camila Zanluca, Daria Elena Camacho, Guillermo Comach, Claudia Nunes Duarte Dos Santos
Zika virus (ZIKV) is an emerging arbovirus belonging to the genus flavivirus that comprises other important public health viruses, such as dengue (DENV) and yellow fever (YFV). In general, ZIKV infection is a self-limiting disease, however cases of Guillain-Barré syndrome and congenital brain abnormalities in newborn infants have been reported. Diagnosing ZIKV infection remains a challenge, as viral RNA detection is only applicable until a few days after the onset of symptoms. After that, serological tests must be applied, and, as expected, high cross-reactivity between ZIKV and other flavivirus serology is observed...
March 15, 2018: PLoS Neglected Tropical Diseases
Li Li, Bing Chen, Hongbin Yan, Yannan Zhao, Zhongzi Lou, Jianqiu Li, Baoquan Fu, Xingquan Zhu, Donald P McManus, Jianwu Dai, Wanzhong Jia
BACKGROUND: Hepatocyte-based metacestode culture is an attractive method to study alveolar echinococcosis (AE), but it is limited by the relatively short lifespan of cultured hepatocytes in maintaining their normal function. METHODOLOGY/PRINCIPAL FINDINGS: We describe a three-dimensional (3D) hepatic culture system developed from co-cultured hepatocytes and mesenchymal stem cells using a collagen scaffold to study the development of Echinococcus multilocularis larvae...
March 14, 2018: PLoS Neglected Tropical Diseases
Md Abu Sayeed, Kamrul Islam, Motaher Hossain, Noor Jahan Akter, Md Nur Alam, Nishat Sultana, Farhana Khanam, Meagan Kelly, Richelle C Charles, Pavol Kováč, Peng Xu, Jason R Andrews, Stephen B Calderwood, Jakia Amin, Edward T Ryan, Firdausi Qadri
Recognizing cholera cases early, especially in the initial phase of an outbreak and in areas where cholera has not previously circulated, is a high public health priority. Laboratory capacity in such settings is often limited. To address this, we have developed a rapid diagnostic test (RDT) termed Cholkit that is based on an immunochromatographic lateral flow assay for the diagnosis of cholera cases using stool. Cholkit contains a monoclonal antibody (ICL-33) to the O-specific polysaccharide (OSP) component of V...
March 14, 2018: PLoS Neglected Tropical Diseases
Alberto J Leon, Viktoriya Borisevich, Nahal Boroumand, Robert Seymour, Rebecca Nusbaum, Olivier Escaffre, Luoling Xu, David J Kelvin, Barry Rockx
Henipavirus infection causes severe respiratory and neurological disease in humans that can be fatal. To characterize the pathogenic mechanisms of henipavirus infection in vivo, we performed experimental infections in ferrets followed by genome-wide gene expression analysis of lung and brain tissues. The Hendra, Nipah-Bangladesh, and Nipah-Malaysia strains caused severe respiratory and neurological disease with animals succumbing around 7 days post infection. Despite the presence of abundant viral shedding, animal-to-animal transmission did not occur...
March 14, 2018: PLoS Neglected Tropical Diseases
Salma Oktaria, Norma Sofisa Hurif, Wardiansyah Naim, Hok Bing Thio, Tamar E C Nijsten, Jan Hendrik Richardus
BACKGROUND: Poverty has long been considered a risk factor for leprosy and is related to nutritional deficiencies. In this study, we aim to investigate the association between poverty-related diet and nutrition with leprosy. METHODOLOGY/PRINCIPAL FINDINGS: In rural leprosy-endemic areas in Indonesia, we conducted a household-based case-control study using two controls for each case patient (100 recently diagnosed leprosy patients and 200 controls), matched for age and gender...
March 13, 2018: PLoS Neglected Tropical Diseases
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