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https://www.readbyqxmd.com/read/28722594/fatal-leptospira-spp-zika-virus-coinfection-puerto-rico-2016
#1
Paige Neaterour, Aidsa Rivera, Renee L Galloway, Myriam Garcia Negrón, Brenda Rivera-Garcia, Tyler M Sharp
Coinfection with pathogens that cause acute febrile illness (AFI) can complicate patient diagnosis and management. This report describes a fatal case of Leptospira spp./Zika virus (ZIKV) coinfection in Puerto Rico. The patient presented with a 5-day history of AFI; reported behavioral risk factors for leptospirosis; was diagnosed with possible leptospirosis, dengue, chikungunya, or ZIKV disease; and received appropriate treatment of leptospirosis and dengue. Following a 3-day hospitalization, the patient died due to acute gastrointestinal hemorrhage, and kidney and liver failure...
June 26, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28722586/continuous-excretion-of-leptospira-borgpetersenii-ballum-in-mice-assessed-by-viability-quantitative-polymerase-chain-reaction
#2
Marie-Estelle Soupé-Gilbert, Emilie Bierque, Sophie Geroult, Magali Teurlai, Cyrille Goarant
Rodents are the main reservoir animals of leptospirosis. In this study, we characterized and quantified the urinary excretion dynamics of Leptospira by Mus musculus infected with 2 × 10(8) virulent Leptospira borgpetersenii serogroup Ballum. Each micturition was collected separately in metabolic cages, at 12 time points from 7 to 117 days post-infection (dpi). We detected Leptospira in all urine samples collected (up to 8 per time point per mouse) proving that Leptospira excretion is continuous with ca. 90% live L...
July 17, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28722568/epidemiology-of-spotted-fever-group-rickettsioses-and-acute-undifferentiated-febrile-illness-in-villeta-colombia
#3
Álvaro A Faccini-Martínez, Alejandro Ramírez-Hernández, Christian Barreto, Elkin Forero-Becerra, Diego Millán, Elkin Valbuena, Andrea C Sánchez-Alfonso, Wilson O Imbacuán-Pantoja, Jesús A Cortés-Vecino, Luis J Polo-Terán, Néstor Yaya-Lancheros, Jorge Jácome, Ana M Palomar, Sonia Santibáñez, Aránzazu Portillo, José A Oteo, Marylin Hidalgo
Etiology of acute undifferentiated febrile syndrome (AUFS) is often unknown, leading to inaccurate diagnosis and treatment. Villeta town has been identified as an endemic area for spotted fever group (SFG) rickettsioses but little is known about possible amplifier hosts and other Rickettsia species different from Rickettsia rickettsii. Besides, few studies have approached other AUFS etiologies in the region. We investigated the role of dengue, leptospirosis, rickettsioses, human anaplasmosis, and Q fever as possible causes of AUFS in patients from Villeta...
June 19, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28716157/advances-and-challenges-in-barcoding-pathogenic-and-environmental-leptospira
#4
Vanina Guernier, Kathryn J Allan, Cyrille Goarant
Leptospirosis is a zoonotic bacterial disease of global importance. A large spectrum of asymptomatic animal hosts can carry the infection and contribute to the burden of human disease. Environmental sources of human contamination also point to the importance of a hydrotelluric reservoir. Leptospirosis can be caused by as many as 15 different pathogenic or intermediate Leptospira species. However, classification of these bacteria remains complicated through the use of both serological and genetic classification systems that show poor correlation...
July 18, 2017: Parasitology
https://www.readbyqxmd.com/read/28704385/immunoprotective-properties-of-recombinant-liga-and-ligb-in-a-hamster-model-of-acute-leptospirosis
#5
Karen V Evangelista, Kristel Lourdault, James Matsunaga, David A Haake
Leptospirosis is the most widespread zoonosis and is considered a major public health problem worldwide. Currently, there is no widely available vaccine against leptospirosis for use in humans. A purified, recombinant subunit vaccine that includes the last six immunoglobulin-like (Ig-like) domains of the leptospiral protein LigA (LigA7'-13) protects against lethal infection but not renal colonization after challenge by Leptospira interrogans. In this study, we examined whether the addition of the first seven Ig-like domains of LigB (LigB0-7) to LigA7'-13, can enhance immune protection and confer sterilizing immunity in the Golden Syrian hamster model of acute leptospirosis...
2017: PloS One
https://www.readbyqxmd.com/read/28702495/data-on-leptospira-interrogans-sv-pomona-infection-in-meat-workers-in-new-zealand
#6
M Pittavino, A Dreyfus, C Heuer, J Benschop, P Wilson, J Collins-Emerson, P R Torgerson, R Furrer
The data presented in this article are related to the research article entitled "Comparison between Generalized Linear Modelling and Additive Bayesian Network; Identification of Factors associated with the Incidence of Antibodies against Leptospira interrogans sv Pomona in Meat Workers in New Zealand" (Pittavino et al., 2017) [5]. A prospective cohort study was conducted in four sheep slaughtering abattoirs in New Zealand (NZ) (Dreyfus et al., 2015) [1]. Sera were collected twice a year from 384 meat workers and tested by Microscopic Agglutination for Leptospira interrogans sv Pomona (Pomona) infection, one of the most common Leptospira serovars in humans in NZ...
August 2017: Data in Brief
https://www.readbyqxmd.com/read/28702473/malaria-and-chikungunya-detected-using-molecular-diagnostics-among-febrile-kenyan-children
#7
Jesse Waggoner, Julie Brichard, Francis Mutuku, Bryson Ndenga, Claire Jane Heath, Alisha Mohamed-Hadley, Malaya K Sahoo, John Vulule, Martina Lefterova, Niaz Banaei, Dunstan Mukoko, Benjamin A Pinsky, A Desiree LaBeaud
BACKGROUND: In sub-Saharan Africa, malaria is frequently overdiagnosed as the cause of an undifferentiated febrile illness, whereas arboviral illnesses are presumed to be underdiagnosed. METHODS: Sera from 385 febrile Kenyan children, who presented to 1 of 4 clinical sites, were tested using microscopy and real-time molecular assays for dengue virus (DENV), chikungunya virus (CHIKV), malaria, and Leptospira. RESULTS: Malaria was the primary clinical diagnosis for 254 patients, and an arboviral infection (DENV or CHIKV) was the primary diagnosis for 93 patients...
2017: Open Forum Infectious Diseases
https://www.readbyqxmd.com/read/28700741/mononuclear-macrophages-but-not-neutrophils-act-as-major-infiltrating-anti-leptospiral-phagocytes-during-leptospirosis
#8
Xu Chen, Shi-Jun Li, David M Ojcius, Ai-Hua Sun, Wei-Lin Hu, Xu'ai Lin, Jie Yan
OBJECTIVE: To identify the major infiltrating phagocytes during leptospirosis and examine the killing mechanism used by the host to eliminate Leptospira interrogans. METHODS: Major infiltrating phagocytes in Leptospira-infected C3H/HeJ mice were detected by immunohistochemistry. Chemokines and vascular endothelial cell adhesion molecules (VECAMs) of Leptospira-infected mice and leptospirosis patients were detected by microarray and immunohistochemistry. Leptospira-phagocytosing and -killing abilities of human or mouse macrophages and neutrophils, and the roles of intracellular ROS, NO and [Ca2+]i in Leptospira-killing process were evaluated by confocal microscopy and spectrofluorimetry...
2017: PloS One
https://www.readbyqxmd.com/read/28700685/characterization-of-the-molecular-chaperone-clpb-from-the-pathogenic-spirochaete-leptospira-interrogans
#9
Joanna Krajewska, Anna Modrak-Wójcik, Zbigniew J Arent, Daniel Więckowski, Michal Zolkiewski, Agnieszka Bzowska, Sabina Kędzierska-Mieszkowska
Leptospira interrogans is a spirochaete responsible for leptospirosis in mammals. The molecular mechanisms of the Leptospira virulence remain mostly unknown. Recently, it has been demonstrated that an AAA+ chaperone ClpB (a member of the Hsp100 family) from L. interrogans (ClpBLi) is not only essential for survival of Leptospira under the thermal and oxidative stresses, but also during infection of a host. The aim of this study was to provide further insight into the role of ClpB in the pathogenic spirochaetes and explore its biochemical properties...
2017: PloS One
https://www.readbyqxmd.com/read/28700061/molecular-and-serological-characterization-of-leptospira-kirschneri-serogroup-pomona-isolated-from-a-human-case-in-a-brazilian-rural-area
#10
Ilana Teruszkin Balassiano, Juliana Magalhães Vital-Brazil, Tatiane Mendes Varela Ramos, Loeci Natalina Timm, Martha Maria Pereira
INTRODUCTION: Leptospirosis is an important health concern in Brazil. Currently, information on the epidemiology of the disease in the rural areas of the country is lacking. METHODS: Serological and molecular techniques were used to characterize a clinical isolate of Leptospira. RESULTS: The strain CLEP 00060, isolated from a 59-year-old man in a rural area of Rio Grande do Sul state, Brazil, was identified as belonging to L. kirschneri serogroup Pomona serovar Mozdok...
May 2017: Revista da Sociedade Brasileira de Medicina Tropical
https://www.readbyqxmd.com/read/28689507/a-survey-of-zoonotic-pathogens-carried-by-house-mouse-and-black-rat-populations-in-yucatan-mexico
#11
J A Panti-May, R R C DE Andrade, Y Gurubel-González, E Palomo-Arjona, L Sodá-Tamayo, J Meza-Sulú, M Ramírez-Sierra, E Dumonteil, V M Vidal-Martínez, C Machaín-Williams, D DE Oliveira, M G Reis, M A Torres-Castro, M R Robles, S F Hernández-Betancourt, F Costa
The house mouse (Mus musculus) and the black rat (Rattus rattus) are reservoir hosts for zoonotic pathogens, several of which cause neglected tropical diseases (NTDs). Studies of the prevalence of these NTD-causing zoonotic pathogens, in house mice and black rats from tropical residential areas are scarce. Three hundred and two house mice and 161 black rats were trapped in 2013 from two urban neighbourhoods and a rural village in Yucatan, Mexico, and subsequently tested for Trypanosoma cruzi, Hymenolepis diminuta and Leptospira interrogans...
July 10, 2017: Epidemiology and Infection
https://www.readbyqxmd.com/read/28686648/increased-levels-of-soluble-forms-of-e-selectin-and-icam-1-adhesion-molecules-during-human-leptospirosis
#12
Loic Raffray, Claude Giry, Yoga Thirapathi, Anne-Hélène Reboux, Marie-Christine Jaffar-Bandjee, Philippe Gasque
Leptospirosis is a multisystemic zoonotic disease with infiltration of visceral organs by Leptospira. The capacity of the vascular endothelium to grant immune cell recruitment and activation in target organs during the disease course remains poorly characterized. We ascertained the levels of expression of several soluble cell adhesion molecules (CAM) notably expressed by endothelial cells in human leptospirosis. We prospectively enrolled 20 hospitalized patients and compared them to 10 healthy controls. Disease severity was defined by one or more organ failures, or death...
2017: PloS One
https://www.readbyqxmd.com/read/28686494/antibodies-to-various-zoonotic-pathogens-detected-in-feral-swine-sus-scrofa-at-abattoirs-in-texas-usa
#13
Kerri Pedersen, Nathan E Bauer, Sandra Rodgers, Luis R Bazan, Brian T Mesenbrink, Thomas Gidlewski
The zoonotic risk posed to employees by slaughtering feral swine (Sus scrofa) at two abattoirs in Texas was assessed by testing feral swine serum samples for exposure to influenza A virus, Leptospira, Trichinella spiralis, and Toxoplasma gondii. Blood was collected from a total of 376 feral swine between the two facilities during six separate collection periods in 2015. Antibodies to one or more serovars of Leptospira were identified in 48.9% of feral swine tested, with Bratislava and Pomona as the most commonly detected serovars, and antibodies to influenza A virus were detected in 14...
July 7, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28673456/pathogenic-leptospira-spp-in-bats-molecular-investigation-in-southern-brazil
#14
Fabiana Quoos Mayer, Emily Marques Dos Reis, André Vinícius Andrade Bezerra, Cristine Cerva, Júlio Rosa, Samuel Paulo Cibulski, Francisco Esmaile Sales Lima, Susi Missel Pacheco, Rogério Oliveira Rodrigues
The present study aimed to investigate the frequency of pathogenic Leptospira spp. in Brazilian bats and to determine possible risk factors associated to it. Ninety two bats of 12 species were evaluated. Whole genomic DNA from kidneys was extracted and real-time PCR specific to pathogenic Leptospira spp. was applied. Association between the frequency of specimens positive for Leptospira spp. and sex, age, bat species or family, season of collection, geographic localization and feeding habits was evaluated. The results showed that 39...
June 2017: Comparative Immunology, Microbiology and Infectious Diseases
https://www.readbyqxmd.com/read/28668503/spatial-analysis-of-leptospira-infection-in-muskrats-in-lower-saxony-germany-and-the-association-with-human-leptospirosis
#15
Jillian Hurd, Olaf Berke, Zvonimir Poljak, Martin Runge
Leptospirosis has been reported as an emerging zoonosis and the most widespread zoonotic disease in the world. Muskrats (Ondatra zibethicus) have been known to carry Leptospira serovars, which have been linked to Weil's disease - a serious and life threatening disease in humans. In this study, muskrats were sampled across 43 regions of Lower Saxony, Germany, during 2007 to 2009 and were tested for leptospirosis using Polymerase Chain Reaction (PCR). Circular and flexibly shaped spatial scan tests were applied and detected two leptospirosis clusters in Lower Saxony, Germany...
June 24, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28665952/intrinsic-and-extrinsic-factors-related-to-pathogen-infection-in-wild-small-mammals-in-intensive-milk-cattle-and-swine-production-systems
#16
Rosario Lovera, María Soledad Fernández, Jens Jacob, Nidia Lucero, Gabriel Morici, Bibiana Brihuega, María Isabel Farace, Jorge Caracostantogolo, Regino Cavia
BACKGROUND: Understanding the ecological processes that are involved in the transmission of zoonotic pathogens by small mammals may aid adequate and effective management measures. Few attempts have been made to analyze the ecological aspects that influence pathogen infection in small mammals in livestock production systems. We describe the infection of small mammals with Leptospira spp., Brucella spp., Trichinella spp. and Cysticercus fasciolaris and assess the related intrinsic and extrinsic factors in livestock production systems in central Argentina at the small mammal community, population and individual levels...
June 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28660382/epidemiology-behavior-of-leptospirosis-in-ci%C3%A3-naga-de-oro-c%C3%A3-rdoba-colombia
#17
C Ensuncho-Hoyos, V Rodríguez-Rodríguez, A Pérez-Doria, O Vergara, A Calderón-Rangel
The purpose of this study was to determine the epidemiology of leptospirosis in rural areas of Ciénaga de Oro, Córdoba, Colombia, a convenience sampling was carried out on 13 farms. The sample size was 325 reproductive age cows, 11 canine samples, and 20 humans. The samples were subjected to MAT analysis with 11 serogroups of Leptospira interrogans sensu lato. Once the MAT results were received, urine samples were collected from 78 cows, along with 39 water samples, for bacteriological cultures and PCR for the 16S rRNA gene in L...
June 28, 2017: Tropical Animal Health and Production
https://www.readbyqxmd.com/read/28658767/serial-changes-in-complete-blood-counts-in-patients-with-leptospirosis-our-experience
#18
Deepa Sowkur Anandarama Adiga, Salony Mittal, Harini Venugopal, Sowmya Mittal
INTRODUCTION: Leptospirosis is an infectious disease caused by Leptospira interrogans. It is endemic in many parts of the world. The symptoms vary between milder forms to severe type with organ dysfunction. The disease presents with diagnostic challenge as it clinically mimics acute febrile illness due to other causes. AIM: To study serial changes in complete blood counts in patients with leptospirosis. MATERIALS AND METHODS: A retrospectively collected data was prospectively studied for clinical and laboratory data of leptospirosis patients proven by raised IgM titres by ELISA on day 2 (counted from day of admission of patient to hospital) of unexplained fever...
May 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28658269/leptospira-diversity-in-animals-and-humans-in-tahiti-french-polynesia
#19
Vanina Guernier, Vaea Richard, Tuxuan Nhan, Eline Rouault, Anita Tessier, Didier Musso
BACKGROUND: Leptospirosis is a highly endemic bacterial zoonosis in French Polynesia (FP). Nevertheless, data on the epidemiology of leptospirosis in FP are scarce. We conducted molecular studies on Leptospira isolated from humans and the potential main animal reservoirs in order to identify the most likely sources for human infection. METHODOLOGY/PRINCIPAL FINDINGS: Wild rats (n = 113), farm pigs (n = 181) and domestic dogs (n = 4) were screened for Leptospira infection in Tahiti, the most populated island in FP...
June 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28648625/anti-erythrocyte-igg-in-hamsters-with-acute-experimental-infection-by-leptospira-interrogans-serovar-canicola
#20
Ânderson O Sobroza, Guilherme L Dorneles, Márcia S N Machado, Cássia B Silva, Letícia Petry, Andressa Schafer, Raqueli T França, Cinthia M de Andrade, Alfredo Q Antoniazzi, Alexandre A Tonin, Sonia T A Lopes, Micheli M Pillat
The aim of this study was to evaluate the behavior of erythrocyte and platelet, as immunological markers, as well as evaluate the involvement of these factors in hemolytic and hemorrhagic reactions in hamsters experimentally infected by Leptospira interrogans Serovar Canicola. Our experimental design was composed by two randomized groups: Infected Group (IG) (n = 12) and control group (CG) (n = 6). Ninety-six hours after the inoculation, the presence of immunoglobulins (IgG and IgM) and complement C3 levels, related to erythrocytes and platelets, was assessed...
June 22, 2017: Microbial Pathogenesis
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