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https://www.readbyqxmd.com/read/28820881/vector-competence-of-populations-of-aedes-aegypti-from-three-distinct-cities-in-kenya-for-chikungunya-virus
#1
Sheila B Agha, Edith Chepkorir, Francis Mulwa, Caroline Tigoi, Samwel Arum, Milehna M Guarido, Peris Ambala, Betty Chelangat, Joel Lutomiah, David P Tchouassi, Michael J Turell, Rosemary Sang
BACKGROUND: In April, 2004, chikungunya virus (CHIKV) re-emerged in Kenya and eventually spread to the islands in the Indian Ocean basin, South-East Asia, and the Americas. The virus, which is often associated with high levels of viremia in humans, is mostly transmitted by the urban vector, Aedes aegypti. The expansion of CHIKV presents a public health challenge both locally and internationally. In this study, we investigated the ability of Ae. aegypti mosquitoes from three distinct cities in Kenya; Mombasa (outbreak prone), Kisumu, and Nairobi (no documented outbreak) to transmit CHIKV...
August 18, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28820715/limited-transmission-potential-of-takeda-s-tetravalent-dengue-vaccine-candidate-by-aedes-albopictus
#2
Elizabeth A Dietrich, Yee Tsuey Ong, Janae L Stovall, Hansi Dean, Claire Y-H Huang
Recombinant live-attenuated chimeric tetravalent dengue vaccine viruses, TDV-1, -2, -3, and -4, contain the premembrane and envelope genes of dengue virus serotypes 1-4 in the replicative background of the attenuated dengue virus type-2 (DENV-2) PDK-53 vaccine strain. Previous results have shown that these recombinant vaccine viruses demonstrate limited infection and dissemination in Aedes aegypti and are unlikely to be transmitted by the primary mosquito vector of DENVs. In this report, we expand this analysis by assessing vector competence of all four serotypes of the TDV virus in Aedes albopictus, the secondary mosquito vector of DENVs...
August 14, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28820690/scaling-up-of-an-innovative-intervention-to-reduce-risk-of-dengue-chikungunya-and-zika-transmission-in-uruguay-in-the-framework-of-an-intersectoral-approach-with-and-without-community-participation
#3
César Basso, Elsa García da Rosa, Rosario Lairihoy, Ruben M Caffera, Ingrid Roche, Cristina González, Ricardo da Rosa, Alexis Gularte, Eduardo Alfonso-Sierra, Max Petzold, Axel Kroeger, Johannes Sommerfeld
To contribute to the prevention of dengue, chikungunya, and Zika, a process of scaling up an innovative intervention to reduce Aedes aegypti habitats, was carried out in the city of Salto (Uruguay) based on a transdisciplinary analysis of the eco-bio-social determinants. The intervention in one-third of the city included the distributions of plastic bags for all households to collect all discarded water containers that were recollected by the Ministry of Health and the Municipality vector control services. The results were evaluated in 20 randomly assigned clusters of 100 households each, in the intervention and control arm...
August 7, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28817563/assessment-of-risk-of-dengue-and-yellow-fever-virus-transmission-in-three-major-kenyan-cities-based-on-stegomyia-indices
#4
Sheila B Agha, David P Tchouassi, Armanda D S Bastos, Rosemary Sang
Dengue (DEN) and yellow fever (YF) are re-emerging in East Africa, with contributing drivers to this trend being unplanned urbanization and increasingly adaptable anthropophilic Aedes (Stegomyia) vectors. Entomological risk assessment of these diseases remains scarce for much of East Africa and Kenya even in the dengue fever-prone urban coastal areas. Focusing on major urban cities of Kenya, we compared DEN and YF risk in Kilifi County (DEN-outbreak-prone), and Kisumu and Nairobi Counties (no documented DEN outbreaks)...
August 17, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28806786/an-economic-evaluation-of-vector-control-in-the-age-of-a-dengue-vaccine
#5
Christopher Fitzpatrick, Alexander Haines, Mathieu Bangert, Andrew Farlow, Janet Hemingway, Raman Velayudhan
INTRODUCTION: Dengue is a rapidly emerging vector-borne Neglected Tropical Disease, with a 30-fold increase in the number of cases reported since 1960. The economic cost of the illness is measured in the billions of dollars annually. Environmental change and unplanned urbanization are conspiring to raise the health and economic cost even further beyond the reach of health systems and households. The health-sector response has depended in large part on control of the Aedes aegypti and Ae...
August 14, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28805637/wolbachia-mediated-virus-blocking-in-the-mosquito-vector-aedes-aegypti
#6
REVIEW
Gerard Terradas, Elizabeth A McGraw
Viruses transmitted by mosquitoes such as dengue, Zika and West Nile cause a threat to global health due to increased geographical range and frequency of outbreaks. The bacterium Wolbachia pipientis may be the solution reducing disease transmission. Though commonly missing in vector species, the bacterium was artificially and stably introduced into Aedes aegypti to assess its potential for biocontrol. When infected with Wolbachia, mosquitoes become refractory to infection by a range of pathogens, including the aforementioned viruses...
August 2017: Current Opinion in Insect Science
https://www.readbyqxmd.com/read/28803981/first-report-of-coelomomyces-santabrancae-sp-nov-blastocladiomycetes-blastocladiales-infecting-mosquito-larvae-diptera-culicidae-in-central-brazil
#7
M E Rueda-Páramo, C Montalva, W Arruda, É K K Fernandes, C Luz, R A Humber
A project from 2013 to 2017 sought to discover pathogenic fungi and oomycetes from dipteran species that are vectors of major diseases of humans and animals in central Brazil and to begin evaluating the potential of these pathogens as potential biological control agents concentrated on mosquito larvae. Some collecting sites proved to be especially productive for pathogens of naturally occurring mosquito species and for placements of healthy sentinel larvae of Aedes aegypti in various sorts of containers in a gallery forest in the Santa Branca Ecoturismo Private Reserve of Natural Patrimony (RPPN) near Terezópolis de Goiás (GO)...
August 10, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/28800547/dinuclear-silver-i-n-heterocyclic-carbene-complexes-synthesis-characterization-and-larvicidal-activity-of-bis-imidazolium-dinuclear-silver-i-n-heterocyclic-carbene-complexes
#8
Puvana D Selvarajoo, Rosenani A Haque, Umie F M Haziz, Silas W Avicor, Mustafa F F Wajidi, Mohd R Razali
New synthesized bis-imidazolium salts that are linked by xylyl derivatives moiety, 1-4 was reacted with Ag2O to facilitate the formation of dinuclear Ag(I)-N-heterocyclic carbene (NHC) complexes, 5-8, respectively. All the synthesized ligand salts and complexes were characterized by (1)H and (13)C NMR, FTIR spectroscopy and elemental analysis. Molecular structures of compounds 3, 5, and 7 were elucidated by single crystal X-ray diffraction analyses. Larvicidal studies against the Aedes aegypti and Culex quinquefasciatus were carried out on all synthesized compounds following the World Health Organization standard larval susceptibility test...
August 4, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28798803/preparation-of-a-nanoemulsion-with-carapa-guianensis-aublet-meliaceae-oil-by-a-low-energy-solvent-free-method-and-evaluation-of-its-preliminary-residual-larvicidal-activity
#9
Flávia L M Jesus, Fernanda B de Almeida, Jonatas L Duarte, Anna E M F M Oliveira, Rodrigo A S Cruz, Raimundo N P Souto, Ricardo M A Ferreira, Regina Gendzelevski Kelmann, José C T Carvalho, Ana C Lira-Guedes, Marcelino Guedes, Conxita Solans, Caio P Fernandes
Andiroba (Carapa guianensis) seeds are the source of an oil with a wide range of biological activities and ethnopharmacological uses. However, few studies have devoted attention to innovative formulations, including nanoemulsions. The present study aimed to obtain a colloidal system with the andiroba oil using a low-energy and organic-solvent-free method. Moreover, the preliminary residual larvicidal activity of the nanoemulsion against Aedes aegypti was evaluated. Oleic and palmitic acids were the major fatty acids, in addition to the phytosterol β-sitosterol and limonoids (tetranortriterpenoids)...
2017: Evidence-based Complementary and Alternative Medicine: ECAM
https://www.readbyqxmd.com/read/28798323/modeling-the-transmission-and-control-of-zika-in-brazil
#10
Liping Wang, Hongyong Zhao, Sergio Muniz Oliva, Huaiping Zhu
Zika virus, a reemerging mosquito-borne flavivirus, started spread across Central and Southern America and more recently to North America. The most serious impacted country is Brazil. Based on the transmission mechanism of the virus and assessment of the limited data on the reported suspected cases, we establish a dynamical model which allows us to estimate the basic reproduction number R 0 = 2.5020. The wild spreading of the virus make it a great challenge to public health to control and prevention of the virus...
August 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28796799/differential-outcomes-of-zika-virus-infection-in-aedes-aegypti-orally-challenged-with-infectious-blood-meals-and-infectious-protein-meals
#11
Yan-Jang S Huang, Amy C Lyons, Wei-Wen Hsu, So Lee Park, Stephen Higgs, Dana L Vanlandingham
BACKGROUND: Infection of mosquitoes is an essential step for the transmission of mosquito-borne arboviruses in nature. Engorgement of infectious blood meals from viremic infected vertebrate hosts allows the entry of viruses and initiates infection of midgut epithelial cells. Historically, the infection process of arboviruses in mosquitoes has been studied through the engorgement of mosquitoes from viremic laboratory animals or from artificial feeders containing blood mixed with viruses harvested from cell cultures...
2017: PloS One
https://www.readbyqxmd.com/read/28796789/multiple-introductions-of-the-dengue-vector-aedes-aegypti-into-california
#12
Evlyn Pless, Andrea Gloria-Soria, Benjamin R Evans, Vicki Kramer, Bethany G Bolling, Walter J Tabachnick, Jeffrey R Powell
The yellow fever mosquito Aedes aegypti inhabits much of the tropical and subtropical world and is a primary vector of dengue, Zika, and chikungunya viruses. Breeding populations of A. aegypti were first reported in California (CA) in 2013. Initial genetic analyses using 12 microsatellites on collections from Northern CA in 2013 indicated the South Central US region as the likely source of the introduction. We expanded genetic analyses of CA A. aegypti by: (a) examining additional Northern CA samples and including samples from Southern CA, (b) including more southern US populations for comparison, and (c) genotyping a subset of samples at 15,698 SNPs...
August 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28793920/dengue-1-virus-and-vector-competence-of-aedes-aegypti-diptera-culicidae-populations-from-new-caledonia
#13
Elodie Calvez, Laurent Guillaumot, Dominique Girault, Vaea Richard, Olivia O'Connor, Tuterarii Paoaafaite, Magali Teurlai, Nicolas Pocquet, Van-Mai Cao-Lormeau, Myrielle Dupont-Rouzeyrol
BACKGROUND: Dengue virus (DENV) is the arbovirus with the highest incidence in New Caledonia and in the South Pacific region. In 2012-2014, a major DENV-1 outbreak occurred in New Caledonia. The only known vector of DENV in New Caledonia is Aedes aegypti but no study has yet evaluated the competence of New Caledonia Ae. aegypti populations to transmit DENV. This study compared the ability of field-collected Ae. aegypti from different locations in New Caledonia to transmit the DENV-1 responsible for the 2012-2014 outbreak...
August 9, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28793030/mosquito-species-occurrence-in-association-with-landscape-composition-in-green-urban-areas
#14
F R G Montagner, O S Silva, S M Jahnke
Aedes aegypti prefers densely populated habitats, but has been shown to explore less anthropogenic environments. We investigated composition of the abundance of mosquitoes in forested areas and assessed relationships between species occurrences and different types of land use and land cover at three spatial scales (100m, 500m and 1000m). Mosquitoes were collected from October 2012 to March 2013 using oviposition traps. We collected 4,179 mosquitoes in total including at least 10 species. Aedes albopictus and Limatus durhami were eudominant species, representing 90% of all collected individuals...
July 27, 2017: Brazilian Journal of Biology, Revista Brasleira de Biologia
https://www.readbyqxmd.com/read/28793020/intelligent-monitoring-of-aedes-aegypti-in-a-rural-area-of-rio-de-janeiro-state-brazil
#15
Argemiro Sanavria, Claudia Bezerra da Silva, Érica Heleno Electo, Lidiane Cristina Rocha Nogueira, Sandra Maria Gomes Thomé, Isabele da Costa Angelo, Gilmar Ferreira Vita, Talles Eduardo Cabral Sanavria, Elisa Domingues Padua, Denise Glória Gaiotte
The aim of this research was to monitor the presence of females of Aedes aegypti (Linnaeus, 1762) on the Seropédica municipality, Rio de Janeiro State, from 2010 to 2013. For this purpose, the Intelligent Dengue Monitoring (IM-Dengue) and Intelligent Virus Monitoring (IM-Virus) developed by Universidade Federal de Minas Gerais (Ecovec - Minas Gerais, Brazil), were used. IM-Dengue is a tool that allows achieving a weekly overview of A. aegypti infestation, while IM-Virus is another tool that allows detecting dengue virus directly from the mosquito, by Real Time-PCR...
2017: Revista do Instituto de Medicina Tropical de São Paulo
https://www.readbyqxmd.com/read/28790458/zika-virus-replication-in-the-mosquito-culex-quinquefasciatus-in-brazil
#16
Duschinka Rd Guedes, Marcelo Hs Paiva, Mariana Ma Donato, Priscilla P Barbosa, Larissa Krokovsky, Sura W Dos S Rocha, Karina LA Saraiva, Mônica M Crespo, Tatiana Mt Rezende, Gabriel L Wallau, Rosângela Mr Barbosa, Cláudia Mf Oliveira, Maria Av Melo-Santos, Lindomar Pena, Marli T Cordeiro, Rafael F de O Franca, André Ls de Oliveira, Christina A Peixoto, Walter S Leal, Constância Fj Ayres
Zika virus (ZIKV) is a flavivirus that has recently been associated with an increased incidence of neonatal microcephaly and other neurological disorders. The virus is primarily transmitted by mosquito bite, although other routes of infection have been implicated in some cases. The Aedes aegypti mosquito is considered to be the main vector to humans worldwide; however, there is evidence that other mosquito species, including Culex quinquefasciatus, transmit the virus. To test the potential of Cx. quinquefasciatus to transmit ZIKV, we experimentally compared the vector competence of laboratory-reared Ae...
August 9, 2017: Emerging Microbes & Infections
https://www.readbyqxmd.com/read/28777313/co-infection-of-mosquitoes-with-chikungunya-and-dengue-viruses-reveals-modulation-of-the-replication-of-both-viruses-in-midguts-and-salivary-glands-of-aedes-aegypti-mosquitoes
#17
Alain Le Coupanec, Stéphane Tchankouo-Nguetcheu, Pascal Roux, Huot Khun, Michel Huerre, Ronald Morales-Vargas, Margot Enguehard, Dimitri Lavillette, Dorothée Missé, Valérie Choumet
Arthropod-borne virus (arbovirus) infections cause several emerging and resurgent infectious diseases in humans and animals. Chikungunya-affected areas often overlap with dengue-endemic areas. Concurrent dengue virus (DENV) and chikungunya virus (CHIKV) infections have been detected in travelers returning from regions of endemicity. CHIKV and DENV co-infected Aedes albopictus have also been collected in the vicinity of co-infected human cases, emphasizing the need to study co-infections in mosquitoes. We thus aimed to study the pathogen-pathogen interaction involved in these co-infections in DENV/CHIKV co-infected Aedes aegypti mosquitoes...
August 4, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28777090/high-resolution-structure-of-a-kazal-type-serine-protease-inhibitor-from-the-dengue-vector-aedes-aegypti
#18
Ricardo J S Torquato, Stephen Lu, Nadia Helena Martins, Aparecida S Tanaka, Pedro José Barbosa Pereira
Blood-feeding exoparasites are rich sources of protease inhibitors, and the mosquito Aedes aegypti, which is a vector of Dengue virus, Yellow fever virus, Chikungunya virus and Zika virus, is no exception. AaTI is a single-domain, noncanonical Kazal-type serine proteinase inhibitor from A. aegypti that recognizes both digestive trypsin-like serine proteinases and the central protease in blood clotting, thrombin, albeit with an affinity that is three orders of magnitude lower. Here, the 1.4 Å resolution crystal structure of AaTI is reported from extremely tightly packed crystals (∼22% solvent content), revealing the structural determinants for the observed inhibitory profile of this molecule...
August 1, 2017: Acta Crystallographica. Section F, Structural Biology Communications
https://www.readbyqxmd.com/read/28775298/sexual-and-vertical-transmission-of-zika-virus-in-anti-interferon-receptor-treated-rag1-deficient-mice
#19
Clayton W Winkler, Tyson A Woods, Rebecca Rosenke, Dana P Scott, Sonja M Best, Karin E Peterson
Although Zika virus (ZIKV) is primarily transmitted to humans by the Aedes aegypti mosquito, human-to-human transmission has also been observed from males-to-females as well as mother-to-offspring. In the current study, we studied both sexual transmission (STx) and vertical transmission (VTx) of ZIKV using anti-IFNAR1-treatment of Rag1 (-/-) (AIR) mice. These mice have suppressed type I IFN responses and lack adaptive immune responses, leading to a prolonged infection prior to clinical disease. STx of ZIKV from infected AIR males to naive Ifnar1 (-/-) females was observed with greater than 50% incidence, with infection observed in the vaginal tract at early time points...
August 3, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28772238/eco-friendly-fabrication-of-ag-nanostructures-using-the-seed-extract-of-pedalium-murex-an-ancient-indian-medicinal-plant-histopathological-effects-on-the-zika-virus-vector-aedes-aegypti-and-inhibition-of-biofilm-forming-pathogenic-bacteria
#20
Ramachandran Ishwarya, Baskaralingam Vaseeharan, Ramasamy Anuradha, Ravichandran Rekha, Marimuthu Govindarajan, Naiyf S Alharbi, Shine Kadaikunnan, Jamal M Khaled, Giovanni Benelli
The control of Zika virus mosquito vectors and well as the development of drugs in the fight against biofilm-forming microbial pathogens, are timely and important challenges in current bionanoscience. Here we focused on the eco-friendly fabrication of Ag nanostructures using the seed extract of Pedalium murex, an ancient Indian medicinal plant. Initial confirmation of Ag nanoparticles (AgNPs) production was showed by a color change from transparent to dark brown. The UV-Visible spectrum (476nm), X-ray diffraction peaks (101, 200, 220 and 311) and Fourier transform infrared spectroscopy shed light on the production of green-capped AgNPs...
July 25, 2017: Journal of Photochemistry and Photobiology. B, Biology
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