scholarly journals The effects of exposure to pyriproxyfen and predation on Zika virus infection and transmission in Aedes aegypti

2020 ◽  
Vol 14 (11) ◽  
pp. e0008846
Author(s):  
Abdullah A. Alomar ◽  
Bradley H. Eastmond ◽  
Barry W. Alto
Keyword(s):  
Aedes Aegypti ◽  
Zika Virus ◽  
Mosquito Control ◽  
Adult Population ◽  
Adult Emergence ◽  
Control Measures ◽  
Adult Mosquito ◽  
Phenotypic Traits ◽  
Global Public Health ◽  
Prevention Measures

Zika virus (ZIKV) is an emerging mosquito-borne pathogen that can cause global public health threats. In the absence of effective antiviral medications, prevention measures rely largely on reducing the number of adult mosquito vectors by targeting juvenile stages. Despite the importance of juvenile mosquito control measures in reducing adult population size, a full understanding of the effects of these measures in determining mosquito phenotypic traits and in mosquito-arbovirus interactions is poorly understood. Pyriproxyfen is a juvenile hormone analog that primarily blocks adult emergence, but does not cause mortality in larvae. This mechanism has the potential to work in combination with other juvenile sources of mortality in nature such as predation to affect mosquito populations. Here, we experimentally evaluated the effects of juvenile exposure to pyriproxyfen and predatory mosquito Toxorhynchites rutilus on Aedes aegypti phenotypes including susceptibility to ZIKV infection and transmission. We discovered that combined effects of pyriproxyfen and Tx. rutilus led to higher inhibition of adult emergence in Ae. aegypti than observed in pyriproxyfen or Tx. rutilus treatments alone. Adult body size was larger in treatments containing Tx. rutilus and in treatments mimicking the daily mortality of predation compared to control or pyriproxyfen treatments. Susceptibility to infection with ZIKV in Ae. aegypti was reduced in predator treatment relative to those exposed to pyriproxyfen. Disseminated infection, transmission, and titers of ZIKV in Ae. aegypti were similar in all treatments relative to controls. Our data suggest that the combination of pyriproxyfen and Tx. rutilus can inhibit adult Ae. aegypti emergence but may confer a fitness advantage in survivors and does not inhibit their vector competence for ZIKV relative to controls. Understanding the ultimate consequences of juvenile mosquito control measures on subsequent adults’ ability to transmit pathogens is critical to fully understand their overall impacts.

scholarly journals Vector Competence of Aedes aegypti, Aedes albopictus and Culex quinquefasciatus from Brazil and New Caledonia for Three Zika Virus Lineages

Pathogens ◽  
2020 ◽  
Vol 9 (7) ◽  
pp. 575 ◽  
Author(s):  
Rosilainy S. Fernandes ◽  
Olivia O’Connor ◽  
Maria Ignez L. Bersot ◽  
Dominique Girault ◽  
Marguerite R. Dokunengo ◽  
...  
Keyword(s):  
Aedes Aegypti ◽  
Culex Quinquefasciatus ◽  
Zika Virus ◽  
Mosquito Control ◽  
New Caledonia ◽  
Vector Competence ◽  
Control Measures ◽  
The Pacific ◽  
Viral Surveillance ◽  
Virus Strains

Zika virus (ZIKV) has caused severe epidemics in South America beginning in 2015, following its spread through the Pacific. We comparatively assessed the vector competence of ten populations of Aedes aegypti and Ae. albopictus from Brazil and two of Ae. aegypti and one of Culex quinquefasciatus from New Caledonia to transmit three ZIKV isolates belonging to African, Asian and American lineages. Recently colonized mosquitoes from eight distinct sites from both countries were orally challenged with the same viral load (107 TCID50/mL) and examined after 7, 14 and 21 days. Cx. quinquefasciatus was refractory to infection with all virus strains. In contrast, although competence varied with geographical origin, Brazilian and New Caledonian Ae. aegypti could transmit the three ZIKV lineages, with a strong advantage for the African lineage (the only one reaching saliva one-week after challenge). Brazilian Ae. albopictus populations were less competent than Ae. aegypti populations. Ae. albopictus generally exhibited almost no transmission for Asian and American lineages, but was efficient in transmitting the African ZIKV. Viral surveillance and mosquito control measures must be strengthened to avoid the spread of new ZIKV lineages and minimize the transmission of viruses currently circulating.

Investigating Male Aedes aegypti (Diptera: Culicidae) Attraction to Different Oviposition Containers Using Various Configurations of the Sound Gravid Aedes Trap

2019 ◽  
Vol 57 (3) ◽  
pp. 957-961
Author(s):  
Kyran M Staunton ◽  
Barukh B Rohde ◽  
Michael Townsend ◽  
Jianyi Liu ◽  
Mark Desnoyer ◽  
...  
Keyword(s):  
Aedes Aegypti ◽  
Zika Virus ◽  
Disease Transmission ◽  
Urban Landscape ◽  
Mosquito Control ◽  
Transmission Risk ◽  
Northern Australia ◽  
Control Programs ◽  
Male Dispersal ◽  
Olfactory Attractant

Abstract Aedes aegypti (Linnaeus), the primary vectors of the arboviruses dengue virus and Zika virus, continue to expand their global distributions. In efforts to better control such species, several mosquito control programs are investigating the efficacy of rearing and releasing millions of altered male Aedes throughout landscapes to reduce populations and disease transmission risk. Unfortunately, little is known about Ae. aegypti, especially male, dispersal behaviors within urban habitats. We deployed Sound-producing Gravid Aedes Traps (SGATs) in Cairns, northern Australia, to investigate male Ae. aegypti attraction to various oviposition container configurations. The traps were arranged to include: 1) water only, 2) organically infused water, 3) infused water and L3 larvae, 4) infused water and a human-scented lure, and lastly 5) no water or olfactory attractant (dry). Our data suggest that males were more attracted to SGATs representing active larval sites than potential larval sites, but were equally attracted to dry SGATs relative to those containing water and/or infusion. Additionally, we found that female Ae. aegypti were equally attracted to wet SGATs, with or without infusion, but not dry ones. These results suggest that male Ae. aegypti within northern Australia are more attracted to active larval sites and equally attracted to dry containers as wet or infused ones. Additionally, female Ae. aegypti are unlikely to enter dry containers. Such findings contribute to our understanding of potentially attractive features for local and released Ae. aegypti throughout the northern Australian urban landscape.

scholarly journals Global spatial assessment of Aedes aegypti and Culex quinquefasciatus: a scenario of Zika virus exposure

2018 ◽  
Vol 147 ◽  
Author(s):  
Alberto J. Alaniz ◽  
Mario A. Carvajal ◽  
Antonella Bacigalupo ◽  
Pedro E. Cattan
Keyword(s):  
Aedes Aegypti ◽  
Culex Quinquefasciatus ◽  
Zika Virus ◽  
Mosquito Control ◽  
Health Planning ◽  
Risk Level ◽  
Spatially Explicit ◽  
World Population ◽  
Potential Vector ◽  
Risk Zones

AbstractZika virus (ZIKV) is an arbovirus transmitted mainly by Aedes aegypti mosquitoes. Recent scientific evidence on Culex quinquefasciatus has suggested its potential as a vector for ZIKV, which may change the current risk zones. We aimed to quantify the world population potentially exposed to ZIKV in a spatially explicit way, considering the primary vector (A. aegypti) and the potential vector (C. quinquefasciatus). Our model combined species distribution modelling of mosquito species with spatially explicit human population data to estimate ZIKV exposure risk. We estimated the potential global distribution of C. quinquefasciatus and estimated its potential interaction zones with A. aegypti. Then we evaluated the risk zones for ZIKV considering both vectors. Finally, we quantified and compared the people under risk associated with each vector by risk level, country and continent. We found that C. quinquefasciatus had a more temperate distribution until 42° in both hemispheres, while the risk involving A. aegypti is concentrated mainly in tropical latitudes until 35° in both hemispheres. Globally, 4.2 billion people are under risk associated with ZIKV. Around 2.6 billon people are under very high risk associated with C. quinquefasciatus and 1 billion people associated with A. aegypti. Several countries could be exposed to ZIKV, which emphasises the need to clarify the competence of C. quinquefasciatus as a potential vector as soon as possible. The models presented here represent a tool for risk management, public health planning, mosquito control and preventive actions, especially to focus efforts on the most affected areas.

scholarly journals Prevenção da infecção pelo zika vírus nas gestantes

2017 ◽  
Vol 11 (12) ◽  
pp. 5339
Author(s):  
Daiane Santos ◽  
Mariana Alves Pimenta ◽  
Flavio Bittencourt ◽  
Murilo Cesar Nascimento ◽  
Silvana Maria Coelho Leite Fava ◽  
...  
Keyword(s):  
Aedes Aegypti ◽  
Zika Virus ◽  
Health Workers ◽  
Family Health ◽  
Cross Sectional Study ◽  
Prevention Measures ◽  
Cross Sectional ◽  
Exact Test ◽  
Quantitative Descriptive ◽  
Virus Zika

RESUMOObjetivo: avaliar as competências dos ACS no desenvolvimento das atribuições esperadas e definidas pelo Ministério da Saúde nas ações de pré-natal de risco habitual, desenvolvidas no âmbito da ESF, em relação à prevenção da infecção pelo zika vírus na gestação. Método: estudo quantitativo, descritivo, transversal, com coleta de dados em 14 equipes da Estratégia de Saúde da Família, mediante um questionário com três partes: A (enfrentamento ao Aedes aegypti); B (pré-natal de baixo risco) e C (medidas de prevenção pessoal contra o Zika vírus), analisadas por agrupamentos e pelo Teste Exato de Fisher. Resultados: melhor desempenho foi observado em B, seguido de A. As maiores dificuldades estavam relacionadas com a atividade C. Conclusão: há um panorama favorável de atuação desses profissionais, embora com dificuldades quanto à alimentação dos sistemas de informação, à baixa participação comunitária e à pouca integração com o trabalho das equipes. Descritores: Enfermagem; Agente Comunitário de Saúde; Zika Vírus.ABSTRACT Objective: to evaluate the competences of the ACS in the development of the attributions expected and defined by the Ministry of Health in the habitual, risk prenatal actions, developed within the scope of the FHS, in relation to the prevention of infection by the zika virus during pregnancy. Method: quantitative, descriptive, cross-sectional study with data collection in 14 teams of the Family Health Strategy, through a questionnaire with three parts: A (coping with Aedes aegypti); B (low risk prenatal) and C (personal prevention measures against Zika virus), analyzed by clusters and Fisher's Exact Test. Results: better performance was observed in B, followed by A. The greatest difficulties were related to activity C. Conclusion: there is a favorable panorama of these professionals, although with difficulties in feeding information systems, low community participation and little integration with the work of the teams. Descritores: Nursing; Community Health Workers; Zika Virus.RESUMEN Objetivo: evaluar las competencias de los ACS en el desarrollo de las atribuciones esperadas y definidas por el Ministerio de Salud en las acciones de prenatal de riesgo habitual, desarrolladas en el marco de la ESF, en relación a la prevención de la infección por el zika virus en la gestación. Método: estudio cuantitativo, descriptivo, transversal, con recolección de datos en 14 equipos de la Estrategia de Salud de la Familia, mediante un cuestionario con tres partes: A (enfrentamiento al Aedes aegypti); B (prenatal de bajo riesgo) y C (medidas de prevención personal contra el Zika virus), analizadas por agrupaciones y por la prueba exacta de Fisher. Resultados: mejor desempeño fue observado en B, seguido de A. Las mayores dificultades estaban relacionadas con la actividad C. Conclusión: hay un panorama favorable de actuación de estos profesionales, aunque con dificultades en cuanto a la alimentación de los sistemas de información, a la baja participación comunitaria y a la poca integración con el trabajo de los equipos. Descritores: Enfermería; Agentes Comunitarios de Salud; Vírus Zika.

Spinosyns Delivered in Sugar Meals to Aedes aegypti and Aedes albopictus (Diptera: Culicidae): Acute Toxicity and Subacute Effects on Survival, Fecundity, and Fertility

2022 ◽  
Author(s):  
Abdullah A Alomar ◽  
Barry W Alto ◽  
Edward D Walker
Keyword(s):  
Acute Toxicity ◽  
Aedes Aegypti ◽  
Aedes Albopictus ◽  
Nutritive Value ◽  
Mosquito Control ◽  
Environmental Safety ◽  
Adult Mosquito ◽  
Hatch Rate ◽  
Median Lethal Concentrations ◽  
Males And Females

Abstract Sugar is an essential source of nutrition for adult mosquitoes to acquire energy. Toxic sugar bait (TSB) provides a promising method for mosquito control by incorporating toxins into artificial sources of sugar (i.e., toxic baits) presented to wild populations. Spinosyns comprise a family of bacterial secondary metabolites with a unique mode of action against the insect nervous system, an appealing environmental safety profile, and potential for incorporation into sugar baits. This research evaluated acute and subacute effects of spinosad (spinosyns A and D) and spinetoram (spinosyns J and L) in sugar meals on survival, fecundity, and fertility of Aedes aegypti and Aedes albopictus. Acute toxicity of spinosyns doubled from 24 to 48 h of assessment, revealing a relatively slow and cumulative action of the formulated spinosyns. Median lethal concentrations at 48 h were lower for spinetoram than for spinosad, lower for Ae. albopictus than Ae. aegypti, and lower for males than females. When exposed to subacute LC50 concentrations of spinosad and spinetoram for 24 h, survival of males and females of both species was diminished compared with controls, fecundity of females was increased, but fertility as measured by hatch rate of eggs was decreased. The formulations may have increased the nutritive value of the sugar meals thereby boosting fecundity, while toxifying embryos, reducing fertility. The inclusion of subacute effects of spinosyns allows assessment of the broader consequences of TSB for adult mosquito control.

scholarly journals FIELD COMPARISON OF AUTOCIDAL GRAVID OVITRAPS AND IN2CARE TRAPS AGAINST AEDES AEGYPTI IN DOWNTOWN SAINT AUGUSTINE, NORTHEASTERN FLORIDA

2021 ◽  
Vol 68 (1) ◽  
pp. 92-96
Author(s):  
Dena Autry
Keyword(s):  
Aedes Aegypti ◽  
Mosquito Control ◽  
Cost Effective ◽  
Post Treatment ◽  
Adult Mosquito ◽  
Treated Area ◽  
Mosquito Trap ◽  
Significant Difference ◽  
The Mean ◽  
Pre Treatment

Mosquito Control programs are utilizing cost-effective long term autocidal gravid traps because they minimize labor needs while targeting the gravid population of container-breeding mosquitoes. This field study compared the efficacy of the In2Care Mosquito Trap and the Centers for Disease Control and Prevention autocidal gravid ovitrap (CDC-AGO). The study consisted of two control and two treatment sites, and each treatment site had either 100 In2Care Mosquito Traps or 100 CDC-AGOs. Aedes aegypti populations in each site were monitored using Biogent (BG) Sentinel 2 mosquito traps and ovitraps. Analysis of pre- and post-treatment data indicated no significant difference in adult mosquito populations detected by BG traps from either the In2Care or CDC-AGO sites. However, the mean number of eggs collected by ovitraps showed significant reduction in both trap type treated areas posttreatment, compared to pre-treatment. Furthermore, the mean number of egg collections from the In2Care mosquito trap treated area was much less than the collection from the CDC-AGO trap treated area post-treatment.

scholarly journals Alteraciones Neurológicas por virus Zika: Revisión bibliográfica. (Neurological Alterations by the Zika virus: Bibliographic review)

2019 ◽  
Vol 38 (3) ◽  
Author(s):  
Anastasia Bellido Sokol
Keyword(s):  
Nervous System ◽  
Risk Factor ◽  
Virus Infection ◽  
Aedes Aegypti ◽  
Zika Virus ◽  
Adult Population ◽  
Age Group ◽  
Neurological Alterations ◽  
Virus Zika ◽  
Zika Fever

<p>[Neurological Alterations by the Zika virus]</p><p><strong>Resumen</strong> <br />El propósito de la siguiente revisión es establecer la relación documentada entre las alteraciones del sistema nervioso y la presencia de la infección por el virus Zika. El virus Zika, perteneciente a la familia de Flaviviridae, es el responsable de la fiebre del Zika y en la mayoría de casos la manifestación clínica se presenta en forma leve en la población adulta. <br /><br />El mayor interés se atribuye a los recién nacidos por ser el grupo etario más afectado a nivel neurológico por la virulencia del Zika. La presencia del transmisor del virus, mosquito hembra Aedes aegypti en el territorio de Panamá, representa un factor de riesgo para el aumento de la incidencia de la microcefalia en recién nacidos. <br /><br /><strong>Abstract</strong> <br />The purpose of the following review is to establish the documented relationship between alterations of the nervous system and the presence of Zika virus infection. Zika virus, forming part of the Flaviviridae family, is responsible for the Zika fever and in most cases the clinical manifestation occurs mildly in the adult population. <br /><br />The greatest interest is attributed to newborns since it is the age group that is mostly affected at the neurological level by the virulence of Zika. The presence of the viral transmitter, mosquito Aedes aegypti in the territory of Panama, represents a risk factor for the increase in the incidence of microcephaly in newborns.<br /><br /><br /></p>

scholarly journals Trend of mosquito (Diptera: Culicidae) monthly distribution in Sanandaj County of Iran

2021 ◽  
Vol 22 (11) ◽  
Author(s):  
Bahadin Salavati ◽  
AMIR HOSSEIN ZAHIRNIA ◽  
Hassan Nasirian ◽  
SHAHYAD AZARI-HAMIDIAN
Keyword(s):  
Urban Areas ◽  
Mosquito Control ◽  
Mosquito Species ◽  
Control Measures ◽  
Adult Mosquito ◽  
Rural And Urban Areas ◽  
Rural And Urban ◽  
Significant Difference ◽  
Monthly Distribution ◽  
Mosquito Breeding

Abstract. Salavati B, Zahirnia AH, Nasirian H, Hamidian SA. 2021. Trend of mosquito (Diptera: Culicidae) monthly distribution in Sanandaj County of Iran. Biodiversitas 22: 4705-4715. Mosquitoes are the most significant arthropods of medical importance due to their burden of transmitting pathogens and parasites. The present study was designed to investigate the distribution of mosquitos (Diptera: Culicidae) in Sanandaj County in 2018. Sanandaj County was divided into four areas in rural and urban areas, including north, south, east, and west. Four rural and urban areas were randomly selected from four geographical directions. A sampling of larval and adult mosquitoes was performed using standard methods. The dipping technique was used to collect the mosquito larvae. A sampling of adult mosquitoes was performed during feeding on humans and animal baits and resting in the natural indoors, outdoors, and artificial areas. Light traps were also used to collect adult mosquitoes. The larval and adult specimens were identified using the morphology-based key. In total, nine mosquito species, including Anopheles maculipennis s.l., Anopheles superpictus s.l., Culiseta longiareolata, Culiseta subochrea, Culex hortensis, Culex mimeticus, Culex modestus, Culex pipiens, and Culex theileri were inhabited in Sanandaj County. The larval and adult mosquito species trend remains constant for at least 6 months of a year, from May to October. One-way ANOVA didn't reveal a significant difference between mosquito breeding places' habitats and water types, mosquito localities and life stages, monthly mosquito distribution, and adult mosquito resting places. The frequency trends of larval and adult mosquito species remain constant at least for 6 months of a year. It needs to be ready for timely mosquito control measures.

scholarly journals Zika virus epidemiology: from Uganda to world pandemic, an update

2018 ◽  
Vol 146 (6) ◽  
pp. 673-679 ◽  
Author(s):  
C. Talero-Gutiérrez ◽  
A. Rivera-Molina ◽  
C. Pérez-Pavajeau ◽  
I. Ossa-Ospina ◽  
C. Santos-García ◽  
...  
Keyword(s):  
Public Health ◽  
Health Problem ◽  
Zika Virus ◽  
Mosquito Control ◽  
Neurological Diseases ◽  
Local Population ◽  
Public Health Problem ◽  
Control Measures ◽  
Control Treatment ◽  
Zikv Infection

AbstractZika virus (ZIKV) infection is an emergent worldwide public health problem. Historically, 84 countries have reported vector-borne ZIKV transmission, 61 of which report on-going transmission. It is a Flavivirus transmitted through arthropods belonging to the Aedes genus. Since 2015, ZIKV infections have increased dramatically; with 1.3 million people infected during 2015 in Brazil alone. This paper's objective is to highlight the conjectural epidemiological points of the virus’ dissemination. The digital archives Pubmed, MEDLINE, EMBASE and Cochrane were searched for papers that assessed aspects of ZIKV transmission and epidemiology. The first isolation occurred in Uganda in 1947. Since then, important outbreaks were documented globally. Consequently, an emergent public health problem arose from a rapidly increasing incidence and its association with the development of neurological diseases such as microcephaly and Guillain–Barré syndrome. Key factors in the successful containment of outbreaks include surveillance of mosquitos in the neighbourhood, an early mosquito control treatment, an assertive information campaign, and the involvement of the local population and healthcare workers. As such, while ZIKV seems to be spreading globally in a similar manner to other arboviruses, such as Dengue and Chikungunya viruses, it can also be rapidly contained due to the pre-existing availability of necessary resources and regulatory tools as control measures. This review aims to provide a description of those characteristics of ZIKV infection that may be useful in the construction of effective outbreak control strategies.

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