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https://www.readbyqxmd.com/read/28342977/the-role-of-mir-2%C3%A2-13%C3%A2-71-cluster-in-resistance-to-deltamethrin-in-culex-pipiens-pallens
#1
Qin Guo, Yun Huang, Feifei Zou, Bingqian Liu, Mengmeng Tian, Wenyun Ye, Juxin Guo, Xueli Sun, Dan Zhou, Yan Sun, Lei Ma, Bo Shen, Changliang Zhu
Excessive and continuous application of deltamethrin has resulted in the development of deltamethrin resistance among mosquitoes, which becomes a major obstacle for mosquito control. In a previous study, differentially expressed miRNAs between deltamethrin-susceptible (DS) strain and deltamethrin-resistant (DR) strain using illumina sequencing in Culex pipiens pallens were identified. In this study, we applied RNAi and the Centers for Disease Control and Prevention (CDC) bottle bioassay to investigate the relationship between miR-2∼13∼71 cluster (miR-2, miR-13 and miR-71) and deltamethrin resistance...
March 22, 2017: Insect Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28342876/increased-activity-of-unlinked-zika-virus-ns2b-ns3-protease-compared-to-linked-zika-virus-protease
#2
Benjamin D Kuiper, Kristin Slater, Nicholas Spellmon, Joshua Holcomb, Prasanna Medapureddy, Kendall M Muzzarelli, Zhe Yang, Reuben Ovadia, Franck Amblard, Iulia A Kovari, Raymond F Schinazi, Ladislau C Kovari
Zika virus (ZIKV) is a flavivirus spread by daytime-active Aedes spp. mosquitoes such as A. aegypti and A. albopictus. Previously thought to be a mild infection, the latest ZIKV outbreak in the Americas is causally associated with more severe symptoms as well as severe birth defects, such as microcephaly. Currently no vaccine or antiviral exists. However, recent progress has demonstrated the viral NS2B/NS3 protease may be a suitable target for the development of small-molecule antiviral agents. To better understand the ZIKV protease, we expressed, purified, and characterized unlinked and linked NS2B/NS3 protease corresponding to an isolate from the recent outbreak in Puerto Rico...
March 22, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28342669/extended-protection-capabilities-of-an-immature-dendritic-cell-targeting-malaria-sporozoite-vaccine
#3
Kun Luo, Fidel Zavala, James Gordy, Hong Zhang, Richard B Markham
Mouse studies evaluating candidate malaria vaccines have typically examined protective efficacy over the relatively short time frames of several weeks after the final of multiple immunizations. The current study examines the protective ability in a mouse model system of a novel protein vaccine construct in which the adjuvant polyinosinic polycytidilic acid (poly(I:C)) is used in combination with a vaccine in which the immature dendritic cell targeting chemokine, macrophage inflammatory protein 3 alpha (MIP3α), is fused to the circumsporozoite protein (CSP) of Plasmodium falciparum (P...
March 22, 2017: Vaccine
https://www.readbyqxmd.com/read/28342565/mini-review-new-pathogen-profiles-elizabethkingia-anophelis
#4
REVIEW
J Michael Janda, Denise L Lopez
Within a little more than 5 years since its taxonomic description in 2011, from the midgut of mosquitoes, Elizabethkingia anophelis has emerged as an important causes of sepsis in adults and children and in cases of neonatal meningitis. At least 3 moderate- to large-scale outbreaks of disease have been caused by this bacterium, the largest 2 occurring in the Midwest United States in 2015-2016. Several studies suggest that E. anophelis, and not E. meningoseptica, is the predominant human pathogen of this genus; identification to species is difficult...
March 16, 2017: Diagnostic Microbiology and Infectious Disease
https://www.readbyqxmd.com/read/28339472/vector-status-of-aedes-species-determines-geographical-risk-of-autochthonous-zika-virus-establishment
#5
Lauren Gardner, Nan Chen, Sahotra Sarkar
BACKGROUND: The 2015-16 Zika virus pandemic originating in Latin America led to predictions of a catastrophic global spread of the disease. Since the current outbreak began in Brazil in May 2015 local transmission of Zika has been reported in over 60 countries and territories, with over 750 thousand confirmed and suspected cases. As a result of its range expansion attention has focused on possible modes of transmission, of which the arthropod vector-based disease spread cycle involving Aedes species is believed to be the most important...
March 24, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28339458/rapid-surveillance-for-vector-presence-rsvp-development-of-a-novel-system-for-detecting-aedes-aegypti-and-aedes-albopictus
#6
Brian L Montgomery, Martin A Shivas, Sonja Hall-Mendelin, Jim Edwards, Nicholas A Hamilton, Cassie C Jansen, Jamie L McMahon, David Warrilow, Andrew F van den Hurk
BACKGROUND: The globally important Zika, dengue and chikungunya viruses are primarily transmitted by the invasive mosquitoes, Aedes aegypti and Aedes albopictus. In Australia, there is an increasing risk that these species may invade highly urbanized regions and trigger outbreaks. We describe the development of a Rapid Surveillance for Vector Presence (RSVP) system to expedite presence- absence surveys for both species. METHODOLOGY/PRINCIPAL FINDINGS: We developed a methodology that uses molecular assays to efficiently screen pooled ovitrap (egg trap) samples for traces of target species ribosomal RNA...
March 24, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28338754/spatial-quantification-of-the-world-population-potentially-exposed-to-zika-virus
#7
Alberto J Alaniz, Antonella Bacigalupo, Pedro E Cattan
Background: Zika virus is an emerging Flaviviridae virus, which has spread rapidly in the last few years. It has raised concern because it has been associated with fetus microcephaly when pregnant women are infected. The main vector is the mosquito Aedes aegypti , distributed in tropical areas. Methods: Niche modelling techniques were used to estimate the potential distribution area of A. aegypti. This was overlapped with human population density, determining areas of potential transmission risk worldwide...
February 23, 2017: International Journal of Epidemiology
https://www.readbyqxmd.com/read/28337189/elizabethkingia-anophelis-isolated-from-patients-with-multiple-organ-dysfunction-syndrome-and-lower-respiratory-tract-infection-report-of-two-cases-and-literature-review
#8
Shaohua Hu, Tao Jiang, Xia Zhang, Yajun Zhou, Zhengjun Yi, Youxi Wang, Sishou Zhao, Mingxi Wang, Desong Ming, Shicheng Chen
Elizabethkingia anophelis, originally discovered from Anopheles mosquito gut, is an emerging pathogen, especially in immunocompromised patients. We isolated two strains of E. anophelis from two separate patients with multiple organ dysfunction syndrome and lower respiratory tract infection. In this paper, we reviewed the status of E. anophelis infection and its antibiotics resistance from reported cases.
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28337184/the-maternally-inheritable-wolbachia-walbb-induces-refractoriness-to-plasmodium-berghei-in-anopheles-stephensi
#9
Deepak Joshi, Xiaoling Pan, Michael J McFadden, David Bevins, Xiao Liang, Peng Lu, Suzanne Thiem, Zhiyong Xi
The endosymbiont Wolbachia wAlbB induces refractoriness to Plasmodium falciparum in Anopheles stephensi, the primary mosquito vector of human malaria in the Middle East and South Asia. However, it remains unknown whether such refractoriness can be extended to other malaria species. In particular, it was reported that under very specific conditions, wAlbB can enhance Plasmodium infection in some hosts. Here, we measured the impact of wAlbB on the rodent malaria parasite Plasmodium berghei in A. stephensi by comparing the load of oocysts and sporozoites in midguts and salivary glands, respectively, between wAlbB-infected and -uninfected mosquitoes...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28336562/de-novo-assembly-of-the-aedes-aegypti-genome-using-hi-c-yields-chromosome-length-scaffolds
#10
Olga Dudchenko, Sanjit S Batra, Arina D Omer, Sarah K Nyquist, Marie Hoeger, Neva C Durand, Muhammad S Shamim, Ido Machol, Eric S Lander, Aviva Presser Aiden, Erez Lieberman Aiden
The Zika outbreak, spread by the Aedes aegypti mosquito, highlights the need to create high-quality assemblies of large genomes in a rapid and cost-effective fashion. Here, we combine Hi-C data with existing draft assemblies to generate chromosome-length scaffolds. We validate this method by assembling a human genome, de novo, from short reads alone (67X coverage). We then combine our method with draft sequences to create genome assemblies of the mosquito disease vectors Aedes aegypti and Culex quinquefasciatus, each consisting of three scaffolds corresponding to the three chromosomes in each species...
March 23, 2017: Science
https://www.readbyqxmd.com/read/28336346/antiviral-activity-of-the-adenosine-analogue-bcx4430-against-west-nile-virus-and-tick-borne-flaviviruses
#11
Luděk Eyer, Darina Zouharová, Jana Širmarová, Martina Fojtíková, Michal Štefánik, Jan Haviernik, Radim Nencka, Erik de Clercq, Daniel Růžek
There are currently no approved antiviral therapies against medically important human flaviviruses. The imino-C-nucleoside BCX4430 shows broad-spectrum antiviral activity against a wide range of RNA viruses. Here, we demonstrate that BCX4430 inhibits tick-borne species of the genus Flavivirus; however, the antiviral effect varies against individual species. Micro-molar BCX4430 levels inhibited tick-borne encephalitis virus (TBEV); while, approximately 3-8-fold higher concentrations were needed to inhibit louping ill virus and Kyasanur Forest disease virus...
March 20, 2017: Antiviral Research
https://www.readbyqxmd.com/read/28336268/malaria-incidence-during-early-childhood-in-rural-burkina-faso-analysis-of-a-birth-cohort-protected-with-insecticide-treated-mosquito-nets
#12
Sabrina Wehner, Gabriele Stieglbauer, Corneille Traoré, Ali Sie, Heiko Becher, Olaf Müller
BACKGROUND: Even in the high transmission areas of sub-Saharan Africa (SSA), the incidence of falciparum malaria varies greatly depending on factors such as age, rainfall pattern, distance to breeding places, quality of houses, and existing vector control measures. Insecticide-treated mosquito nets (ITN) have now become the vector control standard in nearly all of SSA. This study aims to describe and analyse the incidence of malaria in a cohort of young children protected with ITN in rural West Africa...
March 20, 2017: Acta Tropica
https://www.readbyqxmd.com/read/28336218/malaria-altering-host-attractiveness-and-mosquito-feeding
#13
Lauren Cator
Several studies have suggested that malaria parasites stack the odds of transmission in their favour by manipulating the attraction profiles of their hosts. A recent study provides evidence that a specific parasite factor, (E)-4-hydroxy-3-methyl-but-2-enyl pyrophosphate, may increase both the attractiveness of infected vertebrates and the susceptibility of mosquitoes to infection.
March 20, 2017: Trends in Parasitology
https://www.readbyqxmd.com/read/28335456/mosquito-traps-an-innovative-environmentally-friendly-technique-to-control-mosquitoes
#14
Brigitte Poulin, Gaëtan Lefebvre, Camille Muranyi-Kovacs, Samuel Hilaire
We tested the use of mosquito traps as an alternative to spraying insecticide in Camargue (France) following the significant impacts observed on the non-target fauna through Bti persistence and trophic perturbations. In a village of 600 inhabitants, 16 Techno Bam traps emitting CO₂ and using octenol lures were set from April to November 2016. Trap performance was estimated at 70% overall based on mosquitoes landing on human bait in areas with and without traps. The reduction of Ochlerotatus caspius and Oc...
March 18, 2017: International Journal of Environmental Research and Public Health
https://www.readbyqxmd.com/read/28334297/the-knight-stick-trap-and-knight-stick-sticky-wraps-new-tools-for-stable-fly-diptera-muscidae-management
#15
Jerome A Hogsette, Daniel L Kline
Stable fly, Stomoxys calcitrans (L.) (Diptera: Muscidae), management can be difficult, especially in situations where pesticide usage is restricted or disallowed. Traps have been used for monitoring stable flies, but have rarely been used for management. The Knight Stick (KS) trap recently became available, and preliminary studies indicated that it might be an improvement to traps currently in use. The Olson Sticky Fly trap was chosen as the control trap for the purpose of comparisons. Both traps attract stable flies by alteration of light waves and capture flies on a sticky wrap covering the trap base...
March 20, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334254/selection-realized-heritability-and-fitness-cost-associated-with-dimethoate-resistance-in-a-field-population-of-culex-quinquefasciatus-diptera-culicidae
#16
Mehboob Alam, Muhammad Waqas Sumra, Daniyal Ahmad, Rizwan Mustafa Shah, Muhammad Binyameen, Sarfraz Ali Shad
Mosquitoes are known to be vectors of numerous diseases leading to human morbidity and mortality at large scale in the world. Insecticide resistance has become a serious concern in controlling the insect vectors of public health importance. Dimethoate is an organophosphate insecticide used to control different insect pests including mosquitoes. Biological parameters of susceptible, unselected, and dimethoate-selected strains of Culex quinquefasciatus Say were studied in the laboratory to recognize resistance development potential and associated fitness cost...
March 14, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28333938/the-relationship-between-entomological-indicators-of-aedes-aegypti-abundance-and-dengue-virus-infection
#17
Elizabeth A Cromwell, Steven T Stoddard, Christopher M Barker, Annelies Van Rie, William B Messer, Steven R Meshnick, Amy C Morrison, Thomas W Scott
Routine entomological monitoring data are used to quantify the abundance of Ae. aegypti. The public health utility of these indicators is based on the assumption that greater mosquito abundance increases the risk of human DENV transmission, and therefore reducing exposure to the vector decreases incidence of infection. Entomological survey data from two longitudinal cohort studies in Iquitos, Peru, linked with 8,153 paired serological samples taken approximately six months apart were analyzed. Indicators of Ae...
March 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28333935/dengue-seroprevalence-seroconversion-and-risk-factors-in-dhaka-bangladesh
#18
Parnali Dhar-Chowdhury, Kishor Kumar Paul, C Emdad Haque, Shakhawat Hossain, L Robbin Lindsay, Antonia Dibernardo, W Abdullah Brooks, Michael A Drebot
BACKGROUND: Dengue virus (DENV) activity has been reported in Dhaka, Bangladesh since the early 1960s with the greatest burden of dengue fever and dengue hemorrhagic fever cases observed in 2000. Since this time, the intensity of dengue activity has varied from year to year, and its determining factors remained relatively unknown. In light of such gaps in knowledge, the main objectives of this study were to determine the magnitude of seroprevalence and seroconversion among the surveyed population, and establish the individual/household level risk factors for the presence of DENV antibodies among all age groups of target populations in the city of Dhaka...
March 23, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28333910/establishing-a-timeline-to-discontinue-routine-testing-of-asymptomatic-pregnant-women-for-zika-virus-infection-american-samoa-2016-2017
#19
W Thane Hancock, Heidi M Soeters, Susan L Hills, Ruth Link-Gelles, Mary E Evans, W Randolph Daley, Emily Piercefield, Magele Scott Anesi, Mary Aseta Mataia, Anaise M Uso, Benjamin Sili, Aifili John Tufa, Jacqueline Solaita, Elizabeth Irvin-Barnwell, Dana Meaney-Delman, Jason Wilken, Paul Weidle, Karrie-Ann E Toews, William Walker, Phillip M Talboy, William K Gallo, Nevin Krishna, Rebecca L Laws, Megan R Reynolds, Alaya Koneru, Carolyn V Gould
The first patients with laboratory-confirmed cases of Zika virus disease in American Samoa had symptom onset in January 2016 (1). In response, the American Samoa Department of Health (ASDoH) implemented mosquito control measures (1), strategies to protect pregnant women (1), syndromic surveillance based on electronic health record (EHR) reports (1), Zika virus testing of persons with one or more signs or symptoms of Zika virus disease (fever, rash, arthralgia, or conjunctivitis) (1-3), and routine testing of all asymptomatic pregnant women in accordance with CDC guidance (2,3)(...
March 24, 2017: MMWR. Morbidity and Mortality Weekly Report
https://www.readbyqxmd.com/read/28332822/screening-of-wolbachia-endosymbiont-infection-in-aedes-aegypti-mosquitoes-using-attenuated-total-reflection-mid-infrared-spectroscopy
#20
Aazam Khoshmanesh, Dale Christensen, David Perez-Guaita, Iñaki Iturbe-Ormaetxe, Scott L O'Neill, Don McNaughton, Bayden R Wood
Dengue fever is the most common mosquito transmitted viral infection afflicting humans, estimated to generate around 390 million infections each year in over 100 countries. The introduction of the endosymbiotic bacterium Wolbachia into Aedes aegypti mosquitoes has the potential to greatly reduce the public health burden of the disease. This approach requires extensive PCR (Polymerase Chain Reaction) testing of the Wolbachia-infection status of mosquitoes in areas where Wolbachia-A. aegypti are released. Here we report the first example of small organism mid-infrared spectroscopy where we have applied Attenuated Total Reflection Fourier Transform Infrared (ATR-FTIR) spectroscopy and multivariate modelling methods to determine sex, age and the presence of Wolbachia (wMel strain) in laboratory mosquitoes and sex and age in field mosquitoes...
March 23, 2017: Analytical Chemistry
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