Varsovia Cevallos

Varsovia Cevallos
Instituto Nacional de Investigación en Salud Pública | INSPI · Centro de investigación en Enfermedades Infecciosas y Vectoriales CIREV, Quito-Ecuador

Ph.D. Entomology
Research leader Gestión de Investigación. Instituto Nacional de Investigación en Salud Pública - INSPI

About

41
Publications
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180
Citations
Introduction
Additional affiliations
September 2012 - January 2017
Instituto Nacional de Investigación en Salud Pública
Position
  • Lider
September 2011 - present
Instituto Nacional de Investigación en Salud Pública
Position
  • Lider

Publications

Publications (41)
Article
Full-text available
Aedes aegypti and Ae. albopictus transmit several medically important arboviruses to humans. These mosquitoes can carry gregarine protozoan parasites that invade the midgut epithelial cells, where they complete their life cycles. There are no reports of the presence of this parasite associated with Aedes species in Ecuador. This study aimed to iden...
Article
Full-text available
The tiger mosquito, Aedes albopictus, is a vector of multiple viral diseases. Therefore, it is crucial to understand its distribution and the genetic diversity of Ecuadorian populations. This study used a genetic marker to understand aspects of the dynamics of the Ecuadorian populations of Aedes albopictus from five sites along the coastal, Amazon...
Article
Full-text available
T he 2015-2016 outbreak of the Zika virus in Latin America transformed the virus into a global concern that infected an estimated 210,000 patients and caused congenital anomalies in thousands of newborns in Brazil alone 1-6. This public health crisis highlighted the need for rapid and low-cost testing that can be deployed beyond the reach of centra...
Article
Full-text available
In low-resource settings, resilience to infectious disease outbreaks can be hindered by limited access to diagnostic tests. Here we report the results of double-blinded studies of the performance of paper-based diagnostic tests for the Zika and chikungunya viruses in a field setting in Latin America. The tests involved a cell-free expression system...
Preprint
Continued waves, new variants, and limited vaccine deployment mean that SARS-CoV-2 tests remain vital to constrain the COVID-19 pandemic. Affordable, point-of-care (PoC) tests allow rapid screening in non-medical settings. Reverse-transcription loop-mediated isothermal amplification (RT-LAMP) is an appealing approach. A crucial step is to optimize...
Article
Full-text available
Background Dengue, Zika and chikungunya are arboviruses of significant public health importance that are transmitted by Aedes aegypti and Aedes albopictus mosquitoes. In Colombia, where dengue is hyperendemic, and where chikungunya and Zika were introduced in the last decade, more than half of the population lives in areas at risk. The objective of...
Article
Full-text available
Dengue is recognized as a major health issue in large urban tropical cities but is also observed in rural areas. In these environments, physical characteristics of the landscape and sociodemographic factors may influence vector populations at small geographic scales, while prior immunity to the four dengue virus serotypes affects incidence. In 2019...
Article
Full-text available
Background The global impact of Zika virus in Latin America has drawn renewed attention to circulating mosquito-borne viruses in this region, such as dengue and chikungunya. Our objective was to assess socio-ecological factors associated with Aedes mosquito vector density as a measure of arbovirus transmission risk in three cities of potentially re...
Article
Full-text available
Background: Vector-borne diseases are a major cause of disease burden in Guayaquil, Ecuador, especially arboviruses spread by Aedes aegypti mosquitoes. Understanding which household characteristics and risk factors lead to higher Ae. aegypti densities and consequent disease risk can help inform and optimize vector control programs. Methods: Cros...
Article
Standard diagnoses of SARS-CoV-2 infections are done by RNA extraction and real-time RT-PCR (rRT-PCR). However, the need for RNA extraction complicates testing due to increased processing time, high cost, and limited availability of commercial kits. Therefore, alternative methods for rRT-PCR detection of SARS-CoV-2 without RNA extraction were inves...
Preprint
Full-text available
Background The global impact of Zika virus in Latin America and the Caribbean has drawn renewed attention to circulating mosquito-borne viruses in this region, such as dengue and chikungunya. Our objective was to assess socio-ecological factors associated with Aedes mosquito vector density as a measure of arboviral transmission risk in three cities...
Article
Full-text available
Aedes aegypti, also known as the yellow fever mosquito, is the main vector of several arboviruses. In Ecuador, dengue and chikungunya are the most prevalent mosquito-borne diseases. Hence, there is a need to understand the population dynamics and genetic structure of the vector in tropical areas for a better approach towards effective vector contro...
Preprint
Full-text available
Ecuador is one of the countries with the highest biodiversity in the world, this can also be seen in the Culicidae family. However, there are a limited number of studies on this group. This work provides a baseline reference for this insect group and information about numerous potential and vector disease species. Species names and records were ext...
Preprint
Full-text available
Background Vector-borne diseases are a major cause of disease burden in Guayaquil, Ecuador, especially arboviruses spread by Aedes aegypti mosquitoes. Understanding which household characteristics and risk factors lead to higher Ae. aegypti densities and consequent disease risk can help inform and optimize vector control programs. Methods Cross-se...
Preprint
Full-text available
This is the first genetic analysis in Ecuador of Aedes aegypti using fragments of mitochondrial genes, NADH dehydrogenase subunit 4 (ND4) and cytochrome oxidase subunit I (COI). A total of 154 mosquitoes from 23 localities were collected in the Pacific coastal lowlands, Amazon basin lowlands, and the Gal&aacutepagos Islands from 2012 to 2019. The a...
Article
Full-text available
Cutaneous leishmaniasis (CL) is a neglected tropical disease transmitted by species of Phlebotominae sand flies. CL is responsible for more than 1000 reported cases per year in Ecuador. Vector collection studies in Ecuador suggest that there is a strong association between the ecological diversity of an ecosystem, the presence of potential alternat...
Article
Full-text available
In Ecuador, the status of insecticide resistance for Aedes aegypti, the principal arboviral vector in the country, has not been previously evaluated. The aim of this research was to describe the resistance status of Ae. aegypti to the principal insecticides used for vector control in provinces with high reports of arboviral clinical cases. This was...
Article
Full-text available
Aedes (Stegomyia) albopictus (Skuse), (Diptera: Culicidae), the Asian tiger mosquito, is one of the most widespread invasive vector-borne disease insect in tropical and temperate zones. This species has invaded the Americas over the past 3 decades and has spread to six countries. We report Ae. albopictus in Guayaquil city, the first time it has bee...
Article
The wide and rapid spread of Chikungunya (CHIKV) and Zika (ZIKV) viruses represent a global public health problem, especially for tropical and subtropical environments. The early detection of CHIKV and ZIKV in mosquitoes may help to understand the dynamics of the diseases in high-risk areas, and to design data based epidemiological surveillance to...
Article
The detection and identification of natural infections in sand flies by Leishmania protozoan species in endemic areas is a key factor in assessing the risk of leishmaniasis and in designing prevention and control measures for this infectious disease. In this study, we analyzed the Leishmania DNA using nuclear ribosomal internal transcript spacer (I...
Article
We evaluated how the presence of sugar sources impacted the distribution of Aedes aegypti in different habitats in Durán, Ecuador. Land cover and normalized difference vegetation index maps were used to guide a random point sampling routine to select study grids (30 m × 30 m) in low vegetation (LV) and high vegetation (HV). Five individual plants,...
Article
Full-text available
Resumen Navarro JC, Arrivillaga J, Morales D, Ponce P, Cevallos V. 2015. Evaluación rápida de biodiversidad de mosquitos (Diptera: Culicidae) y riesgo en salud ambiental en un área Montana del Chocó Ecuatoriano. Entomotropica 30(16): 160-173. Se evaluó la diversidad alfa de mosquitos y el riesgo a transmisión de patógenos con base en variables de r...
Article
Full-text available
Alpha diversity of mosquitoes was evaluated and the risk of pathogen transmission based on variables of rapid determination. Sampling was conducted in: urban-rural, rural-rural and jungle areas of three provinces. A total of 22 species were collected: 59 % are proven vectors; 45.5 % were captured as adults, 90.9 % as immature phases; two species we...
Article
Full-text available
Chagas disease was described in Ecuador in 1930 in the province of Guayas and thereafter in various provinces. Triatomine were reported in the province of Esmeraldas but no human infection has been described. Here we report the first evidence that the disease does exist in the province of Esmeraldas. In indigenous Awa communities located in the nor...
Article
Full-text available
Se registran por primera vez en el Ecuador dos especies de mosquitos (Diptera: Culicidae), vectores potenciales de los virus de la Fiebre Amarilla y Mayaro. Sabethes amazonicus Gordon and Evans y Haemagogus anastasionis Dyar fueron colectados en fase adulta en una localidad de la provincia de Zamora-Chinchipe, en la cual se han presentado casos de...
Article
This is the first report of sand flies for Carchi Province in Ecuador. Adult females of Lutzomyia trapidoi were collected in the Forest of Chocó, near an indigenous community AWA (locality The Baboso) which previously had no official epidemiological history of cutáneous leishmaniasis.
Article
Two new records of mosquitoes (Diptera: Culicidae) are presented from Ecuador, and both potential vectors of yellow fever virus and Mayaro. Sabethes amazonicus Gordon and Evans and Haemagogus anastasionis Dyar adults were collected in a locality in the province of Zamora-Chinchipe, in which there have been cases of yellow fever previously. This fin...
Article
Full-text available
Los tejidos de larvas de Anastrepha suspensa (Diptera: Tephritidae) fueron examinados para determinar el tejido y la etapa óptima para las preparaciónes de cromosomas. Los tejidos fueron disectados en una solución salina, teñidos en 2% de aceto-orceino por 45 minutos, y aplastados debajo un cubre objeto por la presión del dedo pulgar. Los discos im...
Article
Full-text available
Larval tissues of Anastrepha suspensa (Loew) (Diptera: Tephritidae) were examined to determine the optimal tissue and stage for chromosomal preparations and to determine the karyotype. Tissues were dissected in saline, stained in 2% aceto-orcein for 45 minutes, and squashed on a coverglass by thumb pressure. The compound eye imaginal discs from 6-d...

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Projects

Project (1)
Project
Characterize ecological transmission dynamics and predict areas at risk for ZIKV transmission.