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Elizabeth Anne Jessie Cook, William Anson de Glanville, Lian Francesca Thomas, Samuel Kariuki, Barend Mark de Clare Bronsvoort, Eric Maurice Fèvre
OBJECTIVES: Leptospirosis has been documented in slaughterhouse workers around the world. Risk factors include smoking and drinking at work, and performing tasks such as cleaning offal. This paper examined risk factors for leptospirosis seropositivity in slaughterhouse workers in western Kenya. METHODS: The study was conducted between May 2011 and October 2012. Questionnaires were used to collect information from workers on demographic data, health and hygiene practices in the slaughterhouse...
December 2, 2016: Occupational and Environmental Medicine
Michael J Maze, Holly M Biggs, Matthew P Rubach, Renee L Galloway, Shama Cash-Goldwasser, Kathryn J Allan, Jo E B Halliday, Julian T Hertz, Wilbrod Saganda, Bingileki F Lwezaula, Sarah Cleaveland, Blandina T Mmbaga, Venance P Maro, John A Crump
BACKGROUND: The sole report of annual leptospirosis incidence in continental Africa of 75-102 cases per 100,000 population is from a study performed in August 2007 through September 2008 in the Kilimanjaro Region of Tanzania. To evaluate the stability of this estimate over time, we estimated the incidence of acute leptospirosis in Kilimanjaro Region, northern Tanzania for the time period 2012-2014. METHODOLOGY AND PRINCIPAL FINDINGS: Leptospirosis cases were identified among febrile patients at two sentinel hospitals in the Kilimanjaro Region...
December 2016: PLoS Neglected Tropical Diseases
Berta Restrepo, Juan D Rodas, Carolina Montoya-Ruiz, Angélica M Zuluaga, Gabriel Parra-Henao, Piedad Agudelo-Flórez
We have developed a study in the Embera-Katío indigenous community and we found that the seropositivity for IgG antibodies to Leptospira spp. was 18.1%; to dengue was 61.1%; to arenavirus was 3.1% and to hantavirus was 1.5%. We conclude that this indigenous community live in conditions that promote the reemerging and emerging, infections.
August 2016: Revista Chilena de Infectología: órgano Oficial de la Sociedad Chilena de Infectología
Dianjun Wu, Wenlong Zhang, Tingting Wang, Tao Lin, Xuemin Jin, Xufeng Xie, Jian Guo, Yongguo Cao, Rui Wu
Antibiotics play an important role in the treatment of leptospirosis. Many antibiotics at appropriate concentrations improved the survival rate and alleviated tissue injury, while, when dosing strategies fall below subtherapeutic levels, worse therapeutic effects are seen. In the present study, we investigated the efficacy of low-dose norfloxacin (10, 20 and 30 mg/kg) and ciprofloxacin (1, 2 and 5 mg/kg) against leptospirosis in a hamster model using Leptospira interrogans serovar Icterohaemorrhagiae. The histopathology and bacterial loads of target organs (liver, kidney and lung) were also studied by treatment with norfloxacin at the dose of 10 mg/kg in this model...
November 25, 2016: Microbial Pathogenesis
K Vinod Kumar, Chandan Lall, R Vimal Raj, K Vedhagiri, C Kartick, P Surya, K Natarajaseenivasan, P Vijayachari
Leptospira is the causative agent of leptospirosis, which is an emerging zoonotic disease. Recent studies on Leptospira have demonstrated biofilm formation on abiotic surfaces. The protein expressed in the biofilm was investigated by using SDS-PAGE and immunoblotting in combination with MALDI-TOF mass spectrometry. The proteins expressed in Leptospira biofilm and planktonic cells was analyzed and compared. Among these proteins, one (60 kDa) was found to overexpress in biofilm as compared to the planktonic cells...
November 16, 2016: Microbial Pathogenesis
Wei-Lin Hu, Christopher J Pappas, Jun-Jie Zhang, You-Yun Yang, Jie Yan, Mathieu Picardeau, X Frank Yang
Leptospira interrogans is the agent of leptospirosis, a re-emerging zoonotic disease. Leptospirosis is transmitted to humans through environmental surface waters contaminated by the urine of mammals that are chronically infected by pathogenic strains that are able to survive in water for long periods. Little is known about the regulatory pathways underlying environmental sensing and host adaptation of L. interrogans during its enzootic cycle. This study identifies the EbpA-RpoN regulatory pathway in L. interrogans In this pathway, EbpA, a σ(54) activator and putative prokaryotic enhancer-binding protein (EBP), and the alternative sigma factor RpoN (σ(54)) control expression of at least three genes - encoding AmtB (an ammonium transport protein) and two proteins of unknown function...
November 18, 2016: Applied and Environmental Microbiology
Meredith C Frie, Kelly R Sporer, Joseph C Wallace, Roger K Maes, Lorraine M Sordillo, Paul C Bartlett, Paul M Coussens
Bovine leukemia virus (BLV) is a retrovirus that is widely distributed across US dairy herds: over 83% of herds are BLV-infected and within-herd infection rates can approach 50%. BLV infection reduces both animal longevity and milk production and can interfere with normal immune health. With such a high prevalence of BLV infection in dairy herds, it is essential to understand the circumstances by which BLV negatively affects the immune system of infected cattle. To address this question, BLV- and BLV+ adult, lactating Holstein dairy cows were vaccinated with Bovi-Shield GOLD(®) FP(®) 5 L5 HB and their immune response to vaccination was measured over the course of 28days...
December 2016: Veterinary Immunology and Immunopathology
Giuseppe Ragona, Franco Corrias, Martina Benedetti, Maria Paladini, Federica Salari, Lolanda Altomonte, Mina Martini
This study presents an investigation of Amiata donkey health and quality of milk for human consumption. Thirty-one lactating dairy jennies were examined. The following samples were collected: faecal samples from the rectum of animals for parasitological examination; cervical swabs for the detection of bacteria causing reproductive disorders; and blood samples for serological diagnosis of main zoonotic (Brucella spp., Leptospira spp.) and donkey abortion agents (Brucella spp., Leptospira spp., Salmonella abortus equi, Equine viral arterithis virus, Equine herpesvirus type 1)...
June 3, 2016: Italian Journal of Food Safety
Daniel M Pastula, Aalisha Sahu Khan, Tyler M Sharp, Viema L Biaukula, Taina K Naivalu, Eric Rafai, Ermias Belay, J Erin Staples, Marc Fischer, Olga I Kosoy, Janeen J Laven, Elizabeth J Bennett, Adam W J Jenney, Ravi Narayan Naidu, Robert S Lanciotti, Renee L Galloway, Eric J Nilles, James J Sejvar, Mike Kama
BACKGROUND: In 2014, we investigated a cluster of Guillain-Barre syndrome (GBS) in Fiji that occurred during a dengue epidemic. We designed a case-control study to determine the etiology. METHODS: Cases were patients meeting Brighton Collaboration criteria for GBS with onset from February 2014 to May 2014. Controls were persons without symptoms of GBS who were matched by age group and location. We collected information on demographics and potential exposures. Serum samples were tested for evidence of recent arboviral or Leptospira spp...
September 1, 2016: Journal of the Neurological Sciences
V Simbizi, M N Saulez, A Potts, C Lötter, B Gummow
Most leptospiral infections in horses are asymptomatic; however, acute disease manifestations as well as reproductive failure and recurrent uveitis have been reported. In South Africa, the epidemiology of the disease in horses is not well documented. A serosurvey to determine what serovars were present in horses from Gauteng, KwaZulu-Natal and Western Cape Provinces and to get an estimate of the seroprevalence of leptospirosis was carried out from January 2013 until April 2014 with the assistance of four large equine hospitals located in these provinces...
November 1, 2016: Preventive Veterinary Medicine
Jarlath E Nally, Darrell O Bayles, Daniel Hurley, Séamus Fanning, Barry J McMahon, Zbigniew Arent
We report here the complete genome sequence of Leptospira alstonii serovar Room22 strain GWTS #1. This is the first isolate of L. alstonii to be cultured from a mammal and in western Europe, and it represents a new serovar of pathogenic leptospires.
November 10, 2016: Genome Announcements
Kristel Lourdault, James Matsunaga, David A Haake
Pathogenic species of Leptospira are the causative agents of leptospirosis, a zoonotic disease that causes mortality and morbidity worldwide. The understanding of the virulence mechanisms of Leptospira spp is still at an early stage due to the limited number of genetic tools available for this microorganism. The development of random transposon mutagenesis in pathogenic strains a decade ago has contributed to the identification of several virulence factors. In this study, we used the transposon sequencing (Tn-Seq) technique, which combines transposon mutagenesis with massive parallel sequencing, to study the in vivo fitness of a pool of Leptospira interrogans mutants...
November 2016: PLoS Neglected Tropical Diseases
Luciete Almeida Silva, Kátia Maria da Silva Lima, Ormezinda Celeste Cristo Fernandes, Ilana Teruszkin Balassiano, Kátia Eliane Santos Avelar, Michele Silva de Jesus
INTRODUCTION: Leptospirosis is caused by a bacterium of the genus Leptospira. This study aimed at investigating the seroprevalence of and risk factors for leptospirosis in humans in Manaus, State of Amazonas. METHODS: Interviews were performed, and 1,000 blood serum samples were examined using a microscopic agglutination test. RESULTS: Forty-three cases were positive; there were 10 serotypes, with coagglutination in 8 cases. The most frequently occurring serotypes were Icterohaemorrhagiae (20...
September 2016: Revista da Sociedade Brasileira de Medicina Tropical
Janet C Lindow, Elsio A Wunder, Stephen J Popper, Jin-Na Min, Praveen Mannam, Anup Srivastava, Yi Yao, Kathryn P Hacker, Khadir Raddassi, Patty J Lee, Ruth R Montgomery, Albert C Shaw, Jose E Hagan, Guilherme C Araújo, Nivison Nery, David A Relman, Charles C Kim, Mitermayer G Reis, Albert I Ko
Leptospirosis causes significant morbidity and mortality worldwide; however, the role of the host immune response in disease progression and high case fatality (>10-50%) is poorly understood. We conducted a multi-parameter investigation of patients with acute leptospirosis to identify mechanisms associated with case fatality. Whole blood transcriptional profiling of 16 hospitalized Brazilian patients with acute leptospirosis (13 survivors, 3 deceased) revealed fatal cases had lower expression of the antimicrobial peptide, cathelicidin, and chemokines, but more abundant pro-inflammatory cytokine receptors...
November 2016: PLoS Pathogens
Jonathan Pérez-Flores, Pierre Charruau, Rogelio Cedeño-Vázquez, Daniel Atilano
Sentinel species such as crocodilians are used to monitor the health of ecosystems. However, few studies have documented the presence of zoonotic diseases in wild populations of these reptiles. Herein we analyzed 48 serum samples from Crocodylus acutus (n = 34) and C. moreletii (n = 14) from different sites in the state of Quintana Roo (Mexico) to detect antibodies to Leptospira interrogans by means of a microscopic agglutination test (MAT). Crocodylus acutus and C. moreletii tested positive to 11 and 9 serovars, respectively, with Grippotyphosa being the serovar with the highest prevalence in Cozumel island (100%), Banco Chinchorro Biosphere Reserve (70...
November 2, 2016: EcoHealth
Stefan O Brockmann, Lena Ulrich, Isolde Piechotowski, Christiane Wagner-Wiening, Karsten Nöckler, Anne Mayer-Scholl, Martin Eichner
We analyzed risk factors for Leptospira seropositivity in humans, using data from a population-based cross-sectional zoonosis survey in South Germany (2008/9). Out of 1007 participants 42 (4.2 %) were sero-positive (19/446 men; 23/561 women), indicating that Leptospira exposure and sero-conversion is much more frequent than commonly assumed. Relative risks (RR) for seropositivity with exact 95 % confidence intervals (CI; adjusted for specificity and sensitivity of the ELISA test) were calculated for various exposure factors...
2016: SpringerPlus
Loic Raffray, Claude Giry, David Vandroux, Barbara Kuli, Andry Randrianjohany, Anne-Marie Pequin, Frédéric Renou, Marie-Christine Jaffar-Bandjee, Philippe Gasque
It has long been known that pathogenic Leptospira can mobilize the immune system but the specific contribution of neutrophils to control the infectious challenge remains to be clarified. We herein analyzed the phenotype of circulating neutrophils of patients with leptospirosis and healthy controls for the expression of toll-like receptor (TLR) type 2 (TLR2, to sense the leptospiral LPS) and several activation markers: interleukin 8 chemokine receptor CD182 (CXCR2), CD11b of the integrin/opsonin complement receptor type 3 (CR3) and CD15 (ligand of the selectin)...
2016: PloS One
Anne-Laure Zilber, Patrick Belli, Marc Artois, Angeli Kodjo, Zoheira Djelouadji
We report the first two cases of pulmonary presence of leptospires in apparently healthy rats captured in a city park in Lyon (France). Only renal carriage of Leptospira has been described in the literature. Blood serology was performed in parallel with molecular and histological analyses of the kidney and lung samples. We isolated leptospires from the kidneys of two out of three seropositive wild rats. These results were confirmed by specific detection of pathogenic Leptospira by real-time PCR. Moreover, Leptospira DNA was detected in lung tissues...
2016: BioMed Research International
Célia Fontana, Steve Crussard, Nathalie Simon-Dufay, Daniel Pialot, Natalia Bomchil, Jean Reyes
Enumeration of Leptospira, the causative agent of leptospirosis, is arduous mainly because of its slow growth rate. Rapid and reliable tools for numbering leptospires are still lacking. The current standard for Leptospira cultures is the count on Petroff-Hausser chamber under dark-field microscopy, but this method remains time-consuming, requires well-trained operators and lacks reproducibility. Here we present the development of a flow-cytometry technique for counting leptospires. We showed that upon addition of fluorescent dyes, necessary to discriminate the bacterial population from debris, several live Leptospira strains could be enumerated at different physiologic states...
October 23, 2016: Journal of Microbiological Methods
Osman Yeşilbaş, Hasan Serdar Kıhtır, Hamdi Murat Yıldırım, Nevin Hatipoğlu, Esra Şevketoğlu
BACKGROUND: Leptospirosis is a zoonotic infectious disease caused by pathogenic spirochetes of the genus Leptospira. Although it is usually asymptomatic and self-limited, severe potentially fatal illness accompanied by multi-organ failure may occur. CASE REPORT: Here we report an unusual case of severe leptospirosis successfully treated with continuous venovenous hemofiltration (CVVHF) and therapeutic plasma exchange (TPE). The patient presented with pericardial tamponade, renal failure and macrophage activation syndrome, and later suffered prolonged jaundice and sclerosing cholangitis during hospitalization in the pediatric intensive care unit (PICU)...
September 2016: Balkan Medical Journal
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