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https://www.readbyqxmd.com/read/28728590/chikungunya-virus-infection-in-cynomolgus-macaques-following-intradermal-and-aerosol-exposure
#1
Chris M Cirimotich, Eric M Vela, Jennifer Garver, Roy E Barnewall, Brian D Miller, Gabriel T Meister, James V Rogers
BACKGROUND: Chikungunya virus (CHIKV) is transmitted via mosquito bite and potentially by aerosol, causing chikungunya fever and arthritic disease in humans. There are currently no licensed vaccines or antiviral therapeutics to protect against CHIKV infection in humans. Animal models recapitulating human disease, especially for transmission by aerosol, are needed for licensure of such medical countermeasures. METHODS: Cynomolgus macaques (CMs) were challenged by intradermal (ID) inoculation or exposure to an aerosol containing CHIKV Ross strain at different target infectious doses (10(3)-10(7) plaque forming units (PFU))...
July 20, 2017: Virology Journal
https://www.readbyqxmd.com/read/28722623/the-use-of-xenosurveillance-to-detect-human-bacteria-parasites-and-viruses-in-mosquito-bloodmeals
#2
Joseph R Fauver, Alex Gendernalik, James Weger-Lucarelli, Nathan D Grubaugh, Doug E Brackney, Brian D Foy, Gregory D Ebel
Infectious disease surveillance is hindered by several factors, including limited infrastructure and geographic isolation of many resource-poor regions. In addition, the complexities of sample acquisition, processing, and analysis, even in developed regions, can be rate limiting. Therefore, new strategies to survey human populations for emerging pathogens are necessary. Xenosurveillance is a method that utilizes mosquitoes as sampling devices to search for genetic signatures of pathogens in vertebrates. Previously we demonstrated that xenosurveillance can detect viral RNA in both laboratory and field settings...
May 30, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28719283/american-aedes-vexans-mosquitoes-are-competent-vectors-of-zika-virus
#3
Alex Gendernalik, James Weger-Lucarelli, Selene M Garcia Luna, Joseph R Fauver, Claudia Rückert, Reyes A Murrieta, Nicholas Bergren, Demitrios Samaras, Chilinh Nguyen, Rebekah C Kading, Gregory D Ebel
AbstractStarting in 2013-2014, the Americas have experienced a massive outbreak of Zika virus (ZIKV) which has now reached at least 49 countries. Although most cases have occurred in South America and the Caribbean, imported and autochthonous cases have occurred in the United States. Aedes aegypti and Aedes albopictus mosquitoes are known vectors of ZIKV. Little is known about the potential for temperate Aedes mosquitoes to transmit ZIKV. Aedes vexans has a worldwide distribution, is highly abundant in particular localities, aggressively bites humans, and is a competent vector of several arboviruses...
June 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28718976/low-density-lipopolyprotein-inhibits-flavivirus-acquisition-in-aedes-aegypti
#4
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/28716087/explaining-variation-in-adult-anopheles-indoor-resting-abundance-the-relative-effects-of-larval-habitat-proximity-and-insecticide-treated-bed-net-use
#5
Robert S McCann, Joseph P Messina, David W MacFarlane, M Nabie Bayoh, John E Gimnig, Emanuele Giorgi, Edward D Walker
BACKGROUND: Spatial determinants of malaria risk within communities are associated with heterogeneity of exposure to vector mosquitoes. The abundance of adult malaria vectors inside people's houses, where most transmission takes place, should be associated with several factors: proximity of houses to larval habitats, structural characteristics of houses, indoor use of vector control tools containing insecticides, and human behavioural and environmental factors in and near houses. While most previous studies have assessed the association of larval habitat proximity in landscapes with relatively low densities of larval habitats, in this study these relationships were analysed in a region of rural, lowland western Kenya with high larval habitat density...
July 17, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28715426/community-effectiveness-of-pyriproxyfen-as-a-dengue-vector-control-method-a-systematic-review
#6
Dorit Maoz, Tara Ward, Moody Samuel, Pie Müller, Silvia Runge-Ranzinger, Joao Toledo, Ross Boyce, Raman Velayudhan, Olaf Horstick
BACKGROUND: Vector control is the only widely utilised method for primary prevention and control of dengue. The use of pyriproxyfen may be promising, and autodissemination approach may reach hard to reach breeding places. It offers a unique mode of action (juvenile hormone mimic) and as an additional tool for the management of insecticide resistance among Aedes vectors. However, evidence of efficacy and community effectiveness (CE) remains limited. OBJECTIVE: The aim of this systematic review is to compile and analyse the existing literature for evidence on the CE of pyriproxyfen as a vector control method for reducing Ae...
July 17, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28713202/toward-mosquito-control-with-a-green-alga-expression-of-cry-toxins-of-bacillus-thuringiensis-subsp-israelensis-bti-in-the-chloroplast-of-chlamydomonas
#7
Seongjoon Kang, Obed W Odom, Saravanan Thangamani, David L Herrin
We are developing Chlamydomonas strains that can be used for safe and sustainable control of mosquitoes, because they produce proteins from Bacillus thuringiensis subsp. israelensis (Bti) in the chloroplast. Chlamydomonas has a number of advantages for this approach, including genetic controls that are not generally available with industrial algae. The Bti toxin has been used for mosquito control for > 30 years and does not engender resistance; it contains three Cry proteins, Cry4Aa (135 kDa), Cry4Ba (128 kDa) and Cry11Aa (72 kDa), and Cyt1Aa (25 kDa)...
June 2017: Journal of Applied Phycology
https://www.readbyqxmd.com/read/28706521/evolution-and-function-of-thioester-containing-proteins-and-the-complement-system-in-the-innate-immune-response
#8
REVIEW
Upasana Shokal, Ioannis Eleftherianos
The innate immune response is evolutionary conserved among organisms. The complement system forms an important and efficient immune defense mechanism. It consists of plasma proteins that participate in microbial detection, which ultimately results in the production of various molecules with antimicrobial activity. Thioester-containing proteins (TEPs) are a superfamily of secreted effector proteins. In vertebrates, certain TEPs act in the innate immune response by promoting recruitment of immune cells, phagocytosis, and direct lysis of microbial invaders...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28704434/urbanization-is-a-main-driver-for-the-larval-ecology-of-aedes-mosquitoes-in-arbovirus-endemic-settings-in-south-eastern-c%C3%A3-te-d-ivoire
#9
Julien B Z Zahouli, Benjamin G Koudou, Pie Müller, David Malone, Yao Tano, Jürg Utzinger
BACKGROUND: Failure in detecting naturally occurring breeding sites of Aedes mosquitoes can bias the conclusions drawn from field studies, and hence, negatively affect intervention outcomes. We characterized the habitats of immature Aedes mosquitoes and explored species dynamics along a rural-to-urban gradient in a West Africa setting where yellow fever and dengue co-exist. METHODOLOGY: Between January 2013 and October 2014, we collected immature Aedes mosquitoes in water containers in rural, suburban, and urban areas of south-eastern Côte d'Ivoire, using standardized sampling procedures...
July 13, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28701194/characterization-and-productivity-profiles-of-aedes-aegypti-l-breeding-habitats-across-rural-and-urban-landscapes-in-western-and-coastal-kenya
#10
Harun N Ngugi, Francis M Mutuku, Bryson A Ndenga, Peter S Musunzaji, Joel O Mbakaya, Peter Aswani, Lucy W Irungu, Dunstan Mukoko, John Vulule, Uriel Kitron, Angelle D LaBeaud
BACKGROUND: Aedes aegypti, the principal vector for dengue and other emerging arboviruses, breeds preferentially in various man-made and natural container habitats. In the absence of vaccine, epidemiological surveillance and vector control remain the best practices for preventing dengue outbreaks. Effective vector control depends on a good understanding of larval and adult vector ecology of which little is known in Kenya. In the current study, we sought to characterize breeding habitats and establish container productivity profiles of Ae...
July 12, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28699859/understanding-the-role-of-micrornas-in-the-interaction-of-aedes-aegypti-mosquitoes-with-an-insect-specific-flavivirus
#11
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/28699570/camino-verde-the-green-way-evidence-based-community-mobilisation-for-dengue-control-in-nicaragua-and-mexico-feasibility-study-and-study-protocol-for-a-randomised-controlled-trial
#12
Neil Andersson, Jorge Arostegui, Elizabeth Nava-Aguilera, Eva Harris, Robert J Ledogar
BACKGROUND: Since the Aedes aegypti mosquitoes that transmit dengue virus can breed in clean water, WHO-endorsed vector control strategies place sachets of organophosphate pesticide, temephos (Abate), in household water storage containers. These and other pesticide-dependent approaches have failed to curb the spread of dengue and multiple dengue virus serotypes continue to spread throughout tropical and subtropical regions worldwide. A feasibility study in Managua, Nicaragua, generated instruments, intervention protocols, training schedules and impact assessment tools for a cluster randomised controlled trial of community-based approaches to vector control comprising an alternative strategy for dengue prevention and control in Nicaragua and Mexico...
May 30, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28699560/dengue-occurrence-relations-and-serology-cross-sectional-analysis-of-results-from-the-guerrero-state-mexico-baseline-for-a-cluster-randomised-controlled-trial-of-community-mobilisation-for-dengue-prevention
#13
Elizabeth Nava-Aguilera, Arcadio Morales-Pérez, Alejandro Balanzar-Martínez, Ofelia Rodríguez-Ramírez, Abel Jiménez-Alejo, Miguel Flores-Moreno, David Gasga-Salinas, José Legorreta-Soberanis, Sergio Paredes-Solís, Pedro Antonio Morales-Nava, María de Lourdes Soto-Ríos, Robert J Ledogar, Joséfina Coloma, Eva Harris, Neil Andersson
BACKGROUND: The Mexican arm of the Camino Verde trial of community mobilisation for dengue prevention covered three coastal regions of Guerrero state: Acapulco, Costa Grande and Costa Chica. A baseline cross-sectional survey provided data for community mobilisation and for adapting the intervention design to concrete conditions in the intervention areas. METHODS: Trained field teams constructed community profiles in randomly selected clusters, based on observation and key informant interviews...
May 30, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28699559/aedes-aegypti-breeding-ecology-in-guerrero-cross-sectional-study-of-mosquito-breeding-sites-from-the-baseline-for-the-camino-verde-trial-in-mexico
#14
Arcadio Morales-Pérez, Elizabeth Nava-Aguilera, Alejandro Balanzar-Martínez, Antonio Juan Cortés-Guzmán, David Gasga-Salinas, Irma Esther Rodríguez-Ramos, Alba Meneses-Rentería, Sergio Paredes-Solís, José Legorreta-Soberanis, Felipe Gil Armendariz-Valle, Robert J Ledogar, Anne Cockcroft, Neil Andersson
BACKGROUND: Understanding the breeding patterns of Aedes aegypti in households and the factors associated with infestation are important for implementing vector control. The baseline survey of a cluster randomised controlled trial of community mobilisation for dengue prevention in Mexico and Nicaragua collected information about the containers that are the main breeding sites, identified possible actions to reduce breeding, and examined factors associated with household infestation. This paper describes findings from the Mexican arm of the baseline survey...
May 30, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28699557/-where-we-put-little-fish-in-the-water-there-are-no-mosquitoes-a-cross-sectional-study-on-biological-control-of-the-aedes-aegypti-vector-in-90-coastal-region-communities-of-guerrero-mexico
#15
Arcadio Morales-Pérez, Elizabeth Nava-Aguilera, José Legorreta-Soberanis, Antonio Juan Cortés-Guzmán, Alejandro Balanzar-Martínez, Eva Harris, Josefina Coloma, Víctor M Alvarado-Castro, Mónica Violeta Bonilla-Leon, Liliana Morales-Nava, Robert J Ledogar, Anne Cockcroft, Neil Andersson
BACKGROUND: In the Mexican state of Guerrero, some households place fish in water storage containers to prevent the development of mosquito larvae. Studies have shown that larvivorous fish reduce larva count in household water containers, but there is a lack of evidence about whether the use of fish is associated with a reduction in dengue virus infection. We used data from the follow up survey of the Camino Verde cluster randomised controlled trial of community mobilisation to reduce dengue risk to study this association...
May 30, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28699554/coverage-and-beliefs-about-temephos-application-for-control-of-dengue-vectors-and-impact-of-a-community-based-prevention-intervention-secondary-analysis-from-the-camino-verde-trial-in-mexico
#16
José Legorreta-Soberanis, Sergio Paredes-Solís, Arcadio Morales-Pérez, Elizabeth Nava-Aguilera, Felipé René Serrano de Los Santos, Belén Madeline Sánchez-Gervacio, Robert J Ledogar, Anne Cockcroft, Neil Andersson
BACKGROUND: Temephos in domestic water containers remains a mainstay of Latin American government programmes for control of Aedes aegypti and associated illnesses, including dengue. There is little published evidence about coverage of routine temephos programmes. A cluster randomised controlled trial of community mobilisation in Mexico and Nicaragua reduced vector indices, dengue infection, and clinical dengue cases. Secondary analysis from the Mexican arm of the trial examined temephos coverage and beliefs, and the impact of the trial on these outcomes...
May 30, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28699552/assessing-the-effects-of-interventions-for-aedes-aegypti-control-systematic-review-and-meta-analysis-of-cluster-randomised-controlled-trials
#17
Víctor Alvarado-Castro, Sergio Paredes-Solís, Elizabeth Nava-Aguilera, Arcadio Morales-Pérez, Lidia Alarcón-Morales, Norma Alejandra Balderas-Vargas, Neil Andersson
BACKGROUND: The Aedes aegypti mosquito is the vector for dengue fever, yellow fever, chikungunya, and zika viruses. Inadequate vector control has contributed to persistence and increase of these diseases. This review assesses the evidence of effectiveness of different control measures in reducing Aedes aegypti proliferation, using standard entomological indices. METHODS: A systematic search of Medline, Ovid, BVS, LILACS, ARTEMISA, IMBIOMED and MEDIGRAPHIC databases identified cluster randomised controlled trials (CRCTs) of interventions to control Aedes aegypti published between January 2003 and October 2016...
May 30, 2017: BMC Public Health
https://www.readbyqxmd.com/read/28697901/knowledge-and-attitudes-towards-zika-virus-among-medical-students-in-king-abdulaziz-university-jeddah-saudi-arabia
#18
Nahla K Ibrahim, Rana H Moshref, Leena H Moshref, Jawaher B Walid, Hadeel S AlSatti
Zika Virus (ZIKV) and its associated consequences remain vital public health challenge of international concerns. The current study was done to assess knowledge and attitudes towards ZIKV and the factors associated with good knowledge among medical students in King Abdulaziz University, Jeddah. A cross-sectional study was conducted among 426 students. They were selected through multistage stratified random sample method, 2016. A validated, confidential, interviewing questionnaire contained 25 knowledge and 10 attitude items was used...
July 8, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28697811/effect-of-an-intervention-in-storm-drains-to-prevent-aedes-aegypti-reproduction-in-salvador-brazil
#19
Raquel Lima Souza, Vánio André Mugabe, Igor Adolfo Dexheimer Paploski, Moreno S Rodrigues, Patrícia Sousa Dos Santos Moreira, Leile Camila Jacob Nascimento, Christopher Michael Roundy, Scott C Weaver, Mitermayer Galvão Reis, Uriel Kitron, Guilherme Sousa Ribeiro
BACKGROUND: Aedes aegypti, the principal vector for dengue, chikungunya and Zika viruses, is a synanthropic species that uses stagnant water to complete its reproductive cycle. In urban settings, rainfall water draining structures, such as storm drains, may retain water and serve as a larval development site for Aedes spp. reproduction. Herein, we describe the effect of a community-based intervention on preventing standing water accumulation in storm drains and their consequent infestation by adult and immature Ae...
July 11, 2017: Parasites & Vectors
https://www.readbyqxmd.com/read/28691657/a-relevant-in-vitro-human-model-for-the-study-of-zika-virus-antibody-dependent-enhancement
#20
Berlin Londono-Renteria, Andrea Troupin, Jenny C Cardenas, Alex Hall, Omar G Perez, Lucio Cardenas, Adam Hartstone-Rose, Scott B Halstead, Tonya M Colpitts
Zika virus (ZIKV) is a mosquito-borne flavivirus that has recently been responsible for a serious outbreak of disease in South and Central America. Infection with ZIKV has been associated with severe neurological symptoms and the development of microcephaly in unborn fetuses. Many of the regions involved in the current outbreak are known to be endemic for another flavivirus, dengue virus (DENV), which indicates that a large percentage of the population may have pre-existing DENV immunity. Thus, it is vital to investigate what impact pre-existing DENV immunity has on ZIKV infection...
July 8, 2017: Journal of General Virology
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