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https://www.readbyqxmd.com/read/28446677/variable-inhibition-of-zika-virus-replication-by-different-wolbachia-strains-in-mosquito-cell-cultures
#1
Michaela J Schultz, Sharon Isern, Scott F Michael, Ronald B Corley, John Connor, Horacio M Frydman
Mosquito-borne arboviruses are a major source of human disease. One strategy to reduce arbovirus disease is to reduce the mosquito's ability to transmit virus. Mosquito infection with bacterial endosymbiont, Wolbachia pipientis wMel, is a novel strategy to reduce Aedes mosquito competency for flavivirus infection. However, experiments investigating cyclic environmental temperatures have shown a reduction in maternal transmission of wMel potentially weakening the integration of this strain into a mosquito population relative to other Wolbachia strains...
April 26, 2017: Journal of Virology
https://www.readbyqxmd.com/read/28438194/malaria-profiles-and-challenges-in-artemisinin-resistance-containment-in-myanmar
#2
Thet Wai Nwe, Tin Oo, Khin Thet Wai, Shuisen Zhou, Johan van Griensven, Palanivel Chinnakali, Safieh Shah, Aung Thi
BACKGROUND: This study examined evolving malaria profiles from January, 2010 to December, 2014 to evaluate achievements and challenges of implementing measures to prevent and control spread of artemisinin resistance in Myanmar. METHODS: Using National Malaria Control Programme (NMCP) data, a cross-sectional descriptive study of 52 townships in artemisinin-resistant containment areas in Myanmar was conducted. Annual program data were analysed, and trends over time are graphically presented...
April 25, 2017: Infectious Diseases of Poverty
https://www.readbyqxmd.com/read/28435138/proteomic-analysis-of-a-mosquito-host-cell-response-to-persistent-wolbachia-infection
#3
Gerald Baldridge, LeeAnn Higgins, Bruce Witthuhn, Todd Markowski, Abigail Baldridge, Anibal Armien, Ann Fallon
Wolbachia pipientis, an obligate intracellular bacterium associated with arthropods and filarial worms, is a target for filarial disease treatment and provides a gene drive agent for insect vector population suppression/replacement. We compared proteomes of Aedes albopictus mosquito C/wStr1 cells persistently infected with Wolbachia strain wStr, relative to uninfected C7-10 control cells. Among approximately 2,500 proteins, iTRAQ data identified 815 differentially abundant proteins. As functional classes, energy and central intermediary metabolism proteins were elevated in infected cells, while suppressed proteins with roles in host DNA replication, transcription and translation suggested that Wolbachia suppresses pathways that support host cell growth and proliferation...
April 20, 2017: Research in Microbiology
https://www.readbyqxmd.com/read/28431895/hemolymph-proteins-of-anopheles-gambiae-larvae-infected-by-escherichia-coli
#4
Xuesong He, Xiaolong Cao, Yan He, Krishna Bhattarai, Janet Rogers, Steve Hartson, Haobo Jiang
Anopheles gambiae is a major vector of human malaria and its immune system in part determines the fate of ingested parasites. Proteins, hemocytes and fat body in hemolymph are critical components of this system, mediating both humoral and cellular defenses. Here we assessed differences in the hemolymph proteomes of water- and E. coli-pricked mosquito larvae by a gel-LC-MS approach. Among the 1756 proteins identified, 603 contained a signal peptide but accounted for two-third of the total protein amount on the quantitative basis...
April 19, 2017: Developmental and Comparative Immunology
https://www.readbyqxmd.com/read/28425834/rift-valley-fever-vaccines-an-overview-of-the-safety-and-efficacy-of-the-live-attenuated-mp-12-vaccine-candidate
#5
Tetsuro Ikegami
Rift Valley fever (RVF) is a mosquito-borne zoonotic viral disease endemic to Africa and the Arabian Peninsula. High rates of abortion among infected ruminants and hemorrhagic fever in infected humans are major public health concerns. Commercially available veterinary RVF vaccines are important for preventing the spread of the Rift Valley fever virus (RVFV) in endemic countries; however, RVFV outbreaks continue to occur frequently in endemic countries in the 21(st) century. In the U.S., the live-attenuated MP-12 vaccine has been developed for both animal and human vaccination...
April 20, 2017: Expert Review of Vaccines
https://www.readbyqxmd.com/read/28423421/efficacy-of-some-wearable-devices-compared-with-spray-on-insect-repellents-for-the-yellow-fever-mosquito-aedes-aegypti-l-diptera-culicidae
#6
Stacy D Rodriguez, Hae-Na Chung, Kristina K Gonzales, Julia Vulcan, Yiyi Li, Jorge A Ahumada, Hector M Romero, Mario De La Torre, Fangjun Shu, Immo A Hansen
The current Zika health crisis in the Americas has created an intense interest in mosquito control methods and products. Mosquito vectors of Zika are of the genus Aedes, mainly the yellow fever mosquito, Aedes aegypti. L. The use of repellents to alter mosquito host seeking behavior is an effective method for the prevention of mosquito-borne diseases. A large number of different spray-on repellents and wearable repellent devices are commercially available. The efficacies of many repellents are unknown. This study focuses on the efficacy of eleven different repellents in reducing the number of Ae...
January 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/28419266/the-effect-of-parasitism-and-interpopulation-hybridization-on-aedes-albopictus-diptera-culicidae-fitness
#7
Michelle Tseng
Recent research in mosquito population genetics suggests that interpopulation hybridization has likely contributed to the rapid spread of the container-breeding mosquitoes. Here, I used laboratory experiments to investigate whether interpopulation Aedes (Stegomyia) albopictus (Skuse) F1 and F2 hybrids exhibit higher fitness than parental populations, and whether hybrid mosquito performance is related to infection by the coevolved protozoan parasite Ascogregarina taiwanensis (Lien and Levine). Overall, there were significant differences in development time, wing length, and survival between the two parental mosquito populations, but no difference in per capita growth rate r...
April 15, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28419254/evidence-of-zika-virus-rna-fragments-in-aedes-albopictus-diptera-culicidae-field-collected-eggs-from-cama%C3%A3-ari-bahia-brazil
#8
Chelsea T Smartt, Tanise M S Stenn, Tse-Yu Chen, Maria Gloria Teixeira, Erivaldo P Queiroz, Luciano Souza Dos Santos, Gabriel A N Queiroz, Kathleen Ribeiro Souza, Luciano Kalabric Silva, Dongyoung Shin, Walter J Tabachnick
A major mosquito-borne viral disease outbreak caused by Zika virus (ZIKV) occurred in Bahia, Brazil, in 2015, largely due to transmission by the mosquito, Aedes aegypti (L.). Detecting ZIKV in field samples of Ae. aegypti has proven problematic in some locations, suggesting other mosquito species might be contributing to the spread of ZIKV. In this study, several (five) adult Aedes albopictus (Skuse) mosquitoes that emerged from a 2015 field collection of eggs from Camaçari, Bahia, Brazil, were positive for ZIKV RNA; however, attempts to isolate live virus were not successful...
April 14, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28418299/control-of-malaria-vector-mosquitoes-by-insecticide-treated-combinations-of-window-screens-and-eave-baffles
#9
Gerry F Killeen, John P Masalu, Dingani Chinula, Emmanouil A Fotakis, Deogratius R Kavishe, David Malone, Fredros Okumu
We assessed window screens and eave baffles (WSEBs), which enable mosquitoes to enter but not exit houses, as an alternative to indoor residual spraying (IRS) for malaria vector control. WSEBs treated with water, the pyrethroid lambda-cyhalothrin, or the organophosphate pirimiphos-methyl, with and without a binding agent for increasing insecticide persistence on netting, were compared with IRS in experimental huts. Compared with IRS containing the same insecticide, WSEBs killed similar proportions of Anopheles funestus mosquitoes that were resistant to pyrethroids, carbamates and organochlorines and greater proportions of pyrethroid-resistant, early exiting An...
May 2017: Emerging Infectious Diseases
https://www.readbyqxmd.com/read/28417591/effective-mosquito-and-arbovirus-surveillance-using-metabarcoding
#10
J Batovska, S E Lynch, N O I Cogan, K Brown, J M Darbro, E A Kho, M J Blacket
Effective vector and arbovirus surveillance requires timely and accurate screening techniques that can be easily upscaled. Next-generation sequencing (NGS) is a high-throughput technology that has the potential to modernise vector surveillance. When combined with DNA barcoding, it is termed 'metabarcoding'. The aim of our study was to establish a metabarcoding protocol to characterise pools of mosquitoes and screen them for virus. Pools contained 100 morphologically identified individuals, including one Ross River virus (RRV) infected mosquito, with three species present at different proportions: 1, 5, 94%...
April 18, 2017: Molecular Ecology Resources
https://www.readbyqxmd.com/read/28414172/lccl-protein-complex-formation-in-plasmodium-is-critically-dependent-on-lap1
#11
Annie Z Tremp, Vikram Sharma, Victoria Carter, Edwin Lasonder, Johannes T Dessens
Successful sporogony of Plasmodium berghei in vector mosquitoes requires expression of a family of six modular proteins named LCCL lectin domain adhesive-like proteins (LAPs). The LAPs share a subcellular localization in the crystalloid, a unique parasite organelle that forms during ookinete development. Here, LAP interactions in P. berghei were studied using a series of parasite lines stably expressing reporter-tagged LAPs combined with affinity purification and high accuracy label free quantitative mass spectrometry...
April 13, 2017: Molecular and Biochemical Parasitology
https://www.readbyqxmd.com/read/28401307/immunohistochemical-mapping-and-transcript-expression-of-the-gpa2-gpb5-receptor-in-tissues-of-the-adult-mosquito-aedes-aegypti
#12
David A Rocco, Doo Hyun Kim, Jean-Paul V Paluzzi
GPA2/GPB5 is a glycoprotein hormone found in most bilateral metazoans including the mosquito, Aedes aegypti. To elucidate physiological roles and functions of GPA2/GPB5, we aim to identify prospective target tissues by examining the tissue- and sex-specific expression profile of its receptor, the leucine-rich repeat-containing G protein-coupled receptor 1 (LGR1) in the adult mosquito. Western analyses using a heterologous system with CHO-K1 cells, transiently expressing A. aegypti LGR1, yielded a 112-kDa monomeric band and high-molecular weight multimers, which associated with membrane-protein fractions...
April 11, 2017: Cell and Tissue Research
https://www.readbyqxmd.com/read/28399272/baseline-insecticide-susceptibility-screening-against-six-active-ingredients-for-culex-and-aedes-diptera-culicidae-mosquitoes-in-the-united-states
#13
Stephanie L Richards, Jo Anne G Balanay, Melinda Fields, Kurt Vandock
Mosquitoes may develop resistance to insecticide active ingredients (AI). Thus, mosquitoes should be tested for resistance to confirm efficacy of insecticide-based control, inform management decisions, and protect public and environmental health. Our objectives were to determine a baseline of resistance for six AIs used in mosquito control in the United States to assess how resistance differs between mosquito collection location, AI, and mosquito species (container-ovipositing Aedes and Culex that may oviposit in containers or other sources)...
March 9, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28399263/ecological-niche-model-for-predicting-distribution-of-disease-vector-mosquitoes-in-yucat%C3%A3-n-state-m%C3%A3-xico
#14
Carlos M Baak-Baak, David A Moo-Llanes, Nohemi Cigarroa-Toledo, Fernando I Puerto, Carlos Machain-Williams, Guadalupe Reyes-Solis, Yoshinori J Nakazawa, Armando Ulloa-Garcia, Julian E Garcia-Rejon
The majority of the Yucatán State, México, presents subtropical climate that is suitable for many species of mosquitoes that are known to be vectors of diseases, including those from the genera Aedes and Culex. The objective of this study is to identify the geographic distribution of five species from these two genera and estimate the human population at risk of coming in contact with them. We compiled distributional data for Aedes aegypti (L.), Aedes (Howardina) cozumelensis (Diaz Najera), Culex coronator Dyar and Knab, Culex quinquefasciatus Say, and Culex thriambus Dyar from several entomological studies in Yucatán between March 2010 and September 2014...
March 7, 2017: Journal of Medical Entomology
https://www.readbyqxmd.com/read/28394328/a-live-attenuated-zika-virus-vaccine-candidate-induces-sterilizing-immunity-in-mouse-models
#15
Chao Shan, Antonio E Muruato, Bruno T D Nunes, Huanle Luo, Xuping Xie, Daniele B A Medeiros, Maki Wakamiya, Robert B Tesh, Alan D Barrett, Tian Wang, Scott C Weaver, Pedro F C Vasconcelos, Shannan L Rossi, Pei-Yong Shi
Zika virus (ZIKV) infection of pregnant women can cause a wide range of congenital abnormalities, including microcephaly, in the infant, a condition now collectively known as congenital ZIKV syndrome. A vaccine to prevent or significantly attenuate viremia in pregnant women who are residents of or travelers to epidemic or endemic regions is needed to avert congenital ZIKV syndrome, and might also help to suppress epidemic transmission. Here we report on a live-attenuated vaccine candidate that contains a 10-nucleotide deletion in the 3' untranslated region of the ZIKV genome (10-del ZIKV)...
April 10, 2017: Nature Medicine
https://www.readbyqxmd.com/read/28394283/single-round-infectious-particle-antiviral-screening-assays-for-the-japanese-encephalitis-virus
#16
Chien-Yi Lu, Mann-Jen Hour, Ching-Ying Wang, Su-Hua Huang, Wen-Xiang Mu, Yu-Chun Chang, Cheng-Wen Lin
Japanese Encephalitis virus (JEV) is a mosquito-borne flavivirus with a positive-sense single-stranded RNA genome that contains a big open reading frame (ORF) flanked by 5'- and 3'- untranslated regions (UTRs). Nearly 30,000 JE cases with 10,000 deaths are still annually reported in East Asia. Although the JEV genotype III vaccine has been licensed, it elicits a lower protection against other genotypes. Moreover, no effective treatment for a JE case is developed. This study constructed a pBR322-based and cytomegaloviruses (CMV) promoter-driven JEV replicon for the production of JEV single-round infectious particles (SRIPs) in a packaging cell line expressing viral structural proteins...
April 10, 2017: Viruses
https://www.readbyqxmd.com/read/28388320/entomological-investigations-during-early-stages-of-a-chikungunya-outbreak-in-the-united-states-virgin-islands-2014
#17
Joan L Kenney, Kristen L Burkhalter, Mariah L Scott, Janet McAllister, Francine E Lang, Stevie Webster, Dwayne J Maduro, Juanita Johannes, Alistair Liburd, John-Paul Mutebi
During the 2014 chikungunya (CHIK) outbreak in the Caribbean, we performed entomological surveys on 3 United States Virgin Islands (USVI): St. Croix, St. Thomas, and St. John. We aimed to evaluate the potential for chikungunya virus (CHIKV) transmission in the USVI. The surveys took place between June 19, 2014, and June 29, 2014, during the dry season in USVI. A total of 1,929 adult mosquitoes belonging to 4 species- Culex quinquefasciatus (68.4%), Aedes aegypti (29.7%), Ae. mediovittatus (1.3%), and Ae. sollicitans (<1%)-were detected...
March 2017: Journal of the American Mosquito Control Association
https://www.readbyqxmd.com/read/28376893/effects-of-socio-demographic-characteristics-and-household-water-management-on-aedes-aegypti-production-in-suburban-and-rural-villages-in-laos-and-thailand
#18
Nanthasane Vannavong, Razak Seidu, Thor-Axel Stenström, Nsa Dada, Hans J Overgaard
BACKGROUND: Dengue fever is a mosquito-borne disease accounting for 50-100 million annual cases globally. Laos and Thailand are countries in south-east Asia where the disease is endemic in both urban and rural areas. Household water storage containers, which are favourable breeding sites for dengue mosquitoes, are common in these areas, due to intermittent or limited access to water supply. This study assessed the effect of household water management and socio-demographic risk factors on Aedes aegypti infestation of water storage containers...
April 4, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28365225/safety-and-immunogenicity-of-one-versus-two-doses-of-takeda-s-tetravalent-dengue-vaccine-in-children-in-asia-and-latin-america-interim-results-from-a-phase-2-randomised-placebo-controlled-study
#19
Xavier Sáez-Llorens, Vianney Tricou, Delia Yu, Luis Rivera, Suely Tuboi, Pedro Garbes, Astrid Borkowski, Derek Wallace
BACKGROUND: Dengue is the most common mosquito-borne viral disease in human beings, and vector control has not halted its spread worldwide. A dengue vaccine for individuals aged 9 years and older has been licensed, but there remains urgent medical need for a vaccine that is safe and effective against all four dengue virus serotypes (DENV-1-4) in recipients of all ages. Here, we present the preplanned interim analyses at 6 months of a tetravalent dengue vaccine candidate (TDV), which is comprised of an attenuated DENV-2 virus strain (TDV-2) and three chimeric viruses containing the premembrane and envelope protein genes of DENV-1, DENV-3, and DENV-4 genetically engineered into the attenuated TDV-2 genome backbone (TDV-1, TDV-3, and TDV-4)...
March 29, 2017: Lancet Infectious Diseases
https://www.readbyqxmd.com/read/28363515/mosquitoes-of-the-caatinga-2-species-from-periodic-sampling-of-bromeliads-and-tree-holes-in-a-dry-brazilian-forest
#20
Letícia Silva Marteis, Delsio Natal, Maria Anice Mureb Sallum, Antônio Ralph Medeiros-Sousa, Roseli La Corte
The Caatinga is a dry tropical forest, located in the Brazilian semiarid region and rich in phytotelmata. This study investigated the culicid fauna of phytotelmata of the caatinga by sampling for 19 consecutive months aquatic immatures from tree holes and bromeliads. A total of 127L of water was taken from the plants, containing 6764 immature culicids of 16 species, of which 11 (69%) are undescribed and respond to 90% of the total abundance of the specimens collected. Epiphytic bromeliads harbor a large number of immature Culicidae, although terrestrial bromeliads are the most abundant and widely distributed in the region...
March 28, 2017: Acta Tropica
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