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https://www.readbyqxmd.com/read/28731592/arginase-activity-of-leishmania-isolated-from-patients-with-cutaneous-leishmaniasis
#1
Alireza Badirzadeh, Tahereh Taheri, Fatemeh Abedi-Astaneh, Yasaman Taslimi, Zahra Abdossamadi, Hossein Montakhab-Yeganeh, Maryam Aghashahi, Maryam Niyyati, Sima Rafati
Cutaneous leishmaniasis (CL) is one of the most important vector-borne parasitic diseases, highly endemic in Iran, and its prevalence is increasing all over the country. Arginase (ARG) activity in isolated Leishmania parasites from CL patients is yet to be explored. This study aimed to compare the ARG activity of isolated Leishmania promastigotes from CL patients with a standard strain of L. major and its influences on the disease pathogenesis. We recruited 16 confirmed CL patients from Qom province, in central Iran; after detection of Leishmania species using PCR-RFLP, we assessed the levels of ARG in the isolated promastigotes and determined the parasites' growth rate...
July 21, 2017: Parasite Immunology
https://www.readbyqxmd.com/read/28728938/didelphis-albiventris-naturally-infected-with-hepatozoon-canis-in-southeastern-brazil
#2
Maria Regina Lucas da Silva, Felipe Fornazari, Larissa de Castro Demoner, Carlos Roberto Teixeira, Helio Langoni, Lucia Helena O'Dwyer
Hepatozoon species are vector-borne pathogens that infect domestic and wild animals. Marsupials of the species Didelphis albiventris are adapted to urban and peri-urban areas and act as reservoir hosts for several parasites. The present study evaluated the occurrence of infection by Hepatozoon species in synantropic D. albiventris from Botucatu, São Paulo, Brazil. Blood samples and ectoparasites from 19 D. albiventris were collected from urban and peri-urban areas. Hepatozoon spp. detection was performed by microscopy and molecular analysis...
July 14, 2017: Ticks and Tick-borne Diseases
https://www.readbyqxmd.com/read/28727785/novel-crispr-cas9-gene-drive-constructs-reveal-insights-into-mechanisms-of-resistance-allele-formation-and-drive-efficiency-in-genetically-diverse-populations
#3
Jackson Champer, Riona Reeves, Suh Yeon Oh, Chen Liu, Jingxian Liu, Andrew G Clark, Philipp W Messer
A functioning gene drive system could fundamentally change our strategies for the control of vector-borne diseases by facilitating rapid dissemination of transgenes that prevent pathogen transmission or reduce vector capacity. CRISPR/Cas9 gene drive promises such a mechanism, which works by converting cells that are heterozygous for the drive construct into homozygotes, thereby enabling super-Mendelian inheritance. Although CRISPR gene drive activity has already been demonstrated, a key obstacle for current systems is their propensity to generate resistance alleles, which cannot be converted to drive alleles...
July 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28724923/contrasting-evolutionary-patterns-between-two-haplogroups-of-haematobia-exigua-diptera-muscidae-from-the-mainland-and-islands-of-southeast-asia
#4
Van Lun Low, Tiong Kai Tan, Batah Kunalan Prakash, Wei Yin Vinnie-Siow, Sun Tee Tay, Roungthip Masmeatathip, Upik Kesumawati Hadi, Yvonne Ai Lian Lim, Chee Dhang Chen, Yusoff Norma-Rashid, Mohd Sofian-Azirun
Uncovering the hidden diversity and evolutionary history of arthropods of medico-veterinary importance could have significant implications for vector-borne disease control and epidemiological intervention. The buffalo fly Haematobia exigua is an obligate bloodsucking ectoparasite of livestock. As an initial step towards understanding its population structures and biogeographic patterns, we characterized partial cytochrome c oxidase subunit I (COI) and cytochrome b (Cytb) sequences of H. exigua from three distinct geographic regions in Southeast Asia...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724448/systemic-insecticide-treatment-of-the-canine-reservoir-of-trypanosoma-cruzi-induces-high-levels-of-lethality-in-triatoma-infestans-a-principal-vector-of-chagas-disease
#5
Ariel Loza, Adrianna Talaga, Gladys Herbas, Ruben Jair Canaviri, Thalia Cahuasiri, Laura Luck, Alvaro Guibarra, Raquel Goncalves, Juan Antonio Pereira, Sonia A Gomez, Albert Picado, Louisa Alexandra Messenger, Caryn Bern, Orin Courtenay
BACKGROUND: Despite large-scale reductions in Chagas disease prevalence across Central and South America, Trypanosoma cruzi infection remains a considerable public health problem in the Gran Chaco region where vector-borne transmission persists. In these communities, peridomestic animals are major blood-meal sources for triatomines, and household presence of infected dogs increases T. cruzi transmission risk for humans. To address the pressing need for field-friendly, complementary methods to reduce triatomine infestation and interrupt T...
July 19, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28722613/why-did-zika-not-explode-in-cuba-the-role-of-active-community-participation-to-sustain-control-of-vector-borne-diseases
#6
Marta Castro, Dennis Perez, Maria G Guzman, Clare Barrington
As the global public health community develops strategies for sustainable Zika prevention and control, assessment of the Cuban response to Zika provides critical lessons learned. Cuba's early and successful response to Zika, grounded in the country's long-standing dengue prevention and control program, serves as a model of rapid mobilization of intersectoral efforts. Sustaining this response requires applying the evidence generated within the Cuban dengue program that active community participation improves outcomes and is sustainable and cost-effective...
June 19, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28722591/serological-evidence-of-rickettsia-spp-in-western-australian-dogs
#7
Mark David Bennett, Mohammad Yazid Abdad, John Stenos
It has been claimed that dogs can be useful sentinels for public health monitoring of vector-borne infectious diseases, including Rickettsia spp. We used 153 canine blood samples opportunistically collected at Murdoch University Veterinary Hospital and 156 canine sera collected from Aboriginal communities in northwest Western Australia to test for evidence of Rickettsia spp. exposure, using microimmunofluorescence (MIF) in the latter case, and both MIF and polymerase chain reaction (PCR) in the former. Conventional and real-time PCR failed to amplify any Rickettsia spp...
June 12, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28721523/from-endosymbionts-to-host-communities-factors-determining-the-reproductive-success-of-arthropod-vectors
#8
Irit Messika, Mario Garrido, Hadar Kedem, Victor China, Yoni Gavish, Qunfeng Dong, Clay Fuqua, Keith Clay, Hadas Hawlena
Elucidating the factors determining reproductive success has challenged scientists since Darwin, but the exact pathways that shape the evolution of life history traits by connecting extrinsic (e.g., landscape structure) and intrinsic (e.g., female's age and endosymbionts) factors and reproductive success have rarely been studied. Here we collected female fleas from wild rodents in plots differing in their densities and proportions of the most dominant rodent species. We then combined path analysis and model selection approaches to explore the network of effects, ranging from micro to macroscales, determining the reproductive success of these fleas...
July 18, 2017: Oecologia
https://www.readbyqxmd.com/read/28718976/low-density-lipopolyprotein-inhibits-flavivirus-acquisition-in-aedes-aegypti
#9
Z L Wagar, M O Tree, M C Mpoy, M J Conway
Aedes aegypti is the primary vector of a number of human pathogens including dengue virus (DENV) and Zika virus (ZIKV). Ae. aegypti acquires these viruses during the processing of bloodmeals obtained from an infected vertebrate host. Vertebrate blood contains a number of factors that have the potential to modify virus acquisition in the mosquito. Interestingly, low density lipopolyprotein (LDL) levels are decreased during severe DENV infection. Accordingly, we hypothesized that LDL is a modifiable factor that can influence flavivirus acquisition in the mosquito...
July 18, 2017: Insect Molecular Biology
https://www.readbyqxmd.com/read/28717956/retrospective-analysis-of-canine-vector-borne-diseases-cvbd-in-germany-with-emphasis-on-the-endemicity-and-risk-factors-of-leishmaniosis
#10
Majda Globokar Vrhovec, Nikola Pantchev, Klaus Failing, Christian Bauer, Nora Travers-Martin, Horst Zahner
No abstract text is available yet for this article.
July 17, 2017: Parasitology Research
https://www.readbyqxmd.com/read/28715435/spatial-patterns-of-dengue-cases-in-brazil
#11
Fernando Jose Antonio, Andreia Silva Itami, Sergio de Picoli, Jorge Juarez Vieira Teixeira, Renio Dos Santos Mendes
Dengue infection plays a central role in our society, since it is the most prevalent vector-borne viral disease affecting humans. We statistically investigated patterns concerning the spatial spreading of dengue epidemics in Brazil, as well as their temporal evolution in all Brazilian municipalities for a period of 12 years. We showed that the distributions of cases in municipalities follow power laws persistent in time and that the infection scales linearly with the population of the municipalities. We also found that the average number of dengue cases does not have a clear dependence on the longitudinal position of municipalities...
2017: PloS One
https://www.readbyqxmd.com/read/28714353/spatial-analysis-of-temporal-changes-in-the-pandemic-of-severe-cassava-mosaic-disease-in-north-western-tanzania
#12
Anna Maria Szyniszewska, Constantine Busungu, Simon Boniface Boni, Rudolph Rufini Shirima, Hein Bouwmeester, James P Legg
To improve understanding of the dynamics of the cassava mosaic disease (CMD) pandemic front, geospatial approaches were applied to the analysis of three years' data obtained from a 2° by 2° (ca 222km by 222 km) area of north-western Tanzania. A total of 80 farmers' fields were assessed in each of 2009, 2010 and 2011, with 20 evenly-distributed fields per 1° by 1° quadrant. CMD-associated variables (CMD incidence, CMD severity, vector-borne CMD infection and vector abundance) increased in magnitude from 2009-2010, but showed little change from 2010-2011...
July 15, 2017: Phytopathology
https://www.readbyqxmd.com/read/28706938/inhibitors-of-glycosomal-protein-import-provide-new-leads-against-trypanosomiasis
#13
COMMENT
Vishal C Kalel, Leonidas Emmanouilidis, Maciej Dawidowski, Wolfgang Schliebs, Michael Sattler, Grzegorz M Popowicz, Ralf Erdmann
Vector-borne trypanosomatid parasite infections in tropical and sub-tropical countries constitute a major threat to humans and livestock. Trypanosoma brucei parasites are transmitted by tsetse fly and lead to African sleeping sickness in humans and Nagana in cattle. In Latin American countries, Trypanosoma cruzi infections spread by triatomine kissing bugs lead to Chagas disease. Various species of Leishmania transmitted to humans by phlebotomine sandflies manifest in a spectrum of diseases termed Leishmaniasis...
July 3, 2017: Microbial Cell
https://www.readbyqxmd.com/read/28705255/filarioid-infections-in-wild-carnivores-a-multispecies-survey-in-romania
#14
Angela Monica Ionică, Ioana Adriana Matei, Gianluca D'Amico, Jana Ababii, Aikaterini Alexandra Daskalaki, Attila D Sándor, Dorin Valter Enache, Călin Mircea Gherman, Andrei Daniel Mihalca
BACKGROUND: Filarioids are vector-borne parasitic nematodes of vertebrates. In Europe, eight species of filarioids, including zoonotic species, have been reported mainly in domestic dogs, and occasionally in wild carnivores. In Romania, infections with Dirofilaria spp. and Acanthocheilonema reconditum are endemic in domestic dogs. Despite the abundant populations of wild carnivores in the country, their role in the epidemiology of filarioid parasites remains largely unknown. The aim of the present study was to assess the host range, prevalence and distribution of filarioid infections in wild carnivores present in Romania...
July 13, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28705248/prevention-of-feline-leishmaniosis-with-an-imidacloprid-10-flumethrin-4-5-polymer-matrix-collar
#15
Emanuele Brianti, Luigi Falsone, Ettore Napoli, Gabriella Gaglio, Salvatore Giannetto, Maria Grazia Pennisi, Vito Priolo, Maria Stefania Latrofa, Viviana Domenica Tarallo, Fabrizio Solari Basano, Roberto Nazzari, Katrin Deuster, Matthias Pollmeier, Laura Gulotta, Vito Colella, Filipe Dantas-Torres, Gioia Capelli, Domenico Otranto
BACKGROUND: Leishmaniosis caused by Leishmania infantum is one of the most important vector-borne diseases affecting animals and humans worldwide. Dogs are considered main reservoirs of the zoonotic forms, though in the last years the role of cats as reservoirs has been increasingly investigated. Feline leishmaniosis (FeL) occurs in endemic areas and no specific preventive measures have been investigated so far. In this study the efficacy of a 10% imidacloprid/4.5% flumethrin polymer matrix collar, licensed for tick and flea prevention, has been assessed against FeL in a longitudinal study on 204 privately owned cats from the Aeolian islands (Sicily), an area highly endemic for the disease...
July 14, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28701240/modelling-the-influence-of-host-community-composition-in-a-sylvatic-trypanosoma-cruzi-system
#16
Diana Erazo, Juan Cordovez, Carolina Cabrera, Jose E Calzada, Azael Saldaña, Nicole L Gottdenker
Species composition of wild reservoir hosts can influence the transmission and maintenance of multi-host vector borne pathogens. The 'pace of life' hypothesis proposes that the life history strategy of reservoir hosts can influence pathogen transmission of vector borne generalist pathogens. We use empirical data to parameterize a mathematical model that investigates the impacts of host life history traits on vector transmission dynamics of the vector-borne multi-host parasite Trypanosoma cruzi in habitats characterized by different degrees of deforestation and varying host community structure...
July 13, 2017: Parasitology
https://www.readbyqxmd.com/read/28699878/genetically-stable-infectious-schmallenberg-virus-persists-in-foetal-envelopes-of-pregnant-ewes
#17
Antoine Poskin, Ludovic Martinelle, Yves Van der Stede, Claude Saegerman, Brigitte Cay, Nick De Regge
Schmallenberg virus (SBV) is a recently emerged vector-borne virus, inducing congenital defects in bovines, ovines and caprines. Here we have shown that infectious SBV is capable of persisting until the moment of birth in the foetal envelopes of ewes infected with SBV-infectious serum at day 45 (1/5 positive) and 60 (4/6 positive) of gestation. This persistence of at least 100 days is a new aspect of the SBV pathogenesis that could help to explain how SBV overwinters the cold season in temperate climate zones...
July 12, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28699859/understanding-the-role-of-micrornas-in-the-interaction-of-aedes-aegypti-mosquitoes-with-an-insect-specific-flavivirus
#18
Morris Lee, Kayvan Etebari, Sonja Hall-Mendelin, Andrew F van den Hurk, Jody Hobson-Peters, Sreenu Vatipally, Esther Schnettler, Roy Hall, Sassan Asgari
The Flavivirus genus contains some of the most prevalent vector-borne viruses, such as the dengue, Zika and yellow fever viruses that cause devastating diseases in humans. However, the insect-specific clade of flaviviruses is restricted to mosquito hosts, albeit they have retained the general features of the genus, such as genome structure and replication. The interactions between insect-specific flaviviruses (ISFs) and their mosquito hosts are largely unknown. Pathogenic flaviviruses are known to modulate host-derived microRNAs (miRNAs), a class of non-coding RNAs that are important in controlling gene expression...
July 12, 2017: Journal of General Virology
https://www.readbyqxmd.com/read/28694821/mathematical-modelling-of-vector-borne-diseases-and-insecticide-resistance-evolution
#19
Maria Laura Gabriel Kuniyoshi, Fernando Luiz Pio Dos Santos
BACKGROUND: Vector-borne diseases are important public health issues and, consequently, in silico models that simulate them can be useful. The susceptible-infected-recovered (SIR) model simulates the population dynamics of an epidemic and can be easily adapted to vector-borne diseases, whereas the Hardy-Weinberg model simulates allele frequencies and can be used to study insecticide resistance evolution. The aim of the present study is to develop a coupled system that unifies both models, therefore enabling the analysis of the effects of vector population genetics on the population dynamics of an epidemic...
2017: Journal of Venomous Animals and Toxins Including Tropical Diseases
https://www.readbyqxmd.com/read/28694446/ticks-infected-via-co-feeding-transmission-can-transmit-lyme-borreliosis-to-vertebrate-hosts
#20
Alessandro Belli, Anouk Sarr, Olivier Rais, Ryan O M Rego, Maarten J Voordouw
Vector-borne pathogens establish systemic infections in host tissues to maximize transmission to arthropod vectors. Co-feeding transmission occurs when the pathogen is transferred between infected and naive vectors that feed in close spatiotemporal proximity on a host that has not yet developed a systemic infection. Borrelia afzelii is a tick-borne spirochete bacterium that causes Lyme borreliosis (LB) and is capable of co-feeding transmission. Whether ticks that acquire LB pathogens via co-feeding are actually infectious to vertebrate hosts has never been tested...
July 10, 2017: Scientific Reports
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