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Duong Thi Hue K, da Silva Goncalves D, Tran Thuy V, Thi Vo L, Le Thi D, Vu Tuyet N, Nguyen Thi G, Huynh Thi Xuan T, Nguyen Minh N, Nguyen Thanh P, Yacoub S, Simmons CP. Wolbachia wMel strain-mediated effects on dengue virus vertical transmission from Aedes aegypti to their offspring. Parasit Vectors 2023; 16:308. [PMID: 37653429 PMCID: PMC10472731 DOI: 10.1186/s13071-023-05921-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Accepted: 08/09/2023] [Indexed: 09/02/2023] Open
Abstract
BACKGROUND Dengue virus serotypes (DENV-1 to -4) can be transmitted vertically in Aedes aegpti mosquitoes. Whether infection with the wMel strain of the endosymbiont Wolbachia can reduce the incidence of vertical transmission of DENV from infected females to their offspring is not well understood. METHODS A laboratory colony of Vietnamese Ae. aegypti, both with and without wMel infection, were infected with DENV-1 by intrathoracic injection (IT) to estimate the rate of vertical transmission (VT) of the virus. VT in the DENV-infected mosquitoes was calculated via the infection rate estimation from mosquito pool data using maximum likelihood estimation (MLE). RESULTS In 6047 F1 Vietnamese wild-type Ae. aegypti, the MLE of DENV-1 infection was 1.49 per 1000 mosquitoes (95% confidence interval [CI] 0.73-2.74). In 5500 wMel-infected Ae. aegypti, the MLE infection rate was 0 (95% CI 0-0.69). The VT rates between mosquito lines showed a statistically significant difference. CONCLUSIONS The results reinforce the view that VT is a rare event in wild-type mosquitoes and that infection with wMel is effective in reducing VT.
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Affiliation(s)
- Kien Duong Thi Hue
- Oxford University Clinical Research Unit, Wellcome Trust Africa Asia Programme, District 5, Ho Chi Minh City, Vietnam
| | - Daniela da Silva Goncalves
- Oxford University Clinical Research Unit, Wellcome Trust Africa Asia Programme, District 5, Ho Chi Minh City, Vietnam
| | - Vi Tran Thuy
- Oxford University Clinical Research Unit, Wellcome Trust Africa Asia Programme, District 5, Ho Chi Minh City, Vietnam
| | - Long Thi Vo
- Oxford University Clinical Research Unit, Wellcome Trust Africa Asia Programme, District 5, Ho Chi Minh City, Vietnam
| | - Dui Le Thi
- Oxford University Clinical Research Unit, Wellcome Trust Africa Asia Programme, District 5, Ho Chi Minh City, Vietnam
| | - Nhu Vu Tuyet
- Oxford University Clinical Research Unit, Wellcome Trust Africa Asia Programme, District 5, Ho Chi Minh City, Vietnam
| | - Giang Nguyen Thi
- Oxford University Clinical Research Unit, Wellcome Trust Africa Asia Programme, District 5, Ho Chi Minh City, Vietnam
| | - Trang Huynh Thi Xuan
- Oxford University Clinical Research Unit, Wellcome Trust Africa Asia Programme, District 5, Ho Chi Minh City, Vietnam
| | - Nguyet Nguyen Minh
- Oxford University Clinical Research Unit, Wellcome Trust Africa Asia Programme, District 5, Ho Chi Minh City, Vietnam
| | | | - Sophie Yacoub
- Oxford University Clinical Research Unit, Wellcome Trust Africa Asia Programme, District 5, Ho Chi Minh City, Vietnam
- Centre for Tropical Medicine and Global Health, University of Oxford, Oxford, UK
| | - Cameron P. Simmons
- Institute for Vector Borne Disease, Monash University, Clayton Campus, Melbourne, VIC 3168 Australia
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Acero-Sandoval MA, Palacio-Cortés AM, Navarro-Silva MA. Surveillance of Aedes aegypti and Aedes albopictus (Diptera: Culicidae) as a Method for Prevention of Arbovirus Transmission in Urban and Seaport Areas of the Southern Coast of Brazil. JOURNAL OF MEDICAL ENTOMOLOGY 2023; 60:173-184. [PMID: 36305159 DOI: 10.1093/jme/tjac143] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Indexed: 06/16/2023]
Abstract
Entomological surveillance is a traditional method to measure presence, distribution, and seasonal variation of vectors in urban areas, and is essential to targeted control activities to prevent arbovirus transmission. Ovitraps as one of the main components of surveillance programs, enable determination of female oviposition behavior, as well as identification of seasonal variations of the vector. The goals of this study were 1) to detect the mosquitos (Aedes aegypti Linnaeus) and (Aedes albopictus Skuse) (Diptera:Culicidae), in Paranaguá city, 2) to assess ovitrap positive index (OPI), egg density index (EDI), and their relationship with meteorological variables, and 3) to evaluate the vertical transmission of dengue, Zika, and chikungunya in Ae. aegypti and Ae. albopictus. The study was carried out in urban areas of Paranaguá city, an important port region of Brazil, from June 2017 to November 2018. The city was divided into 16 area-clusters. Three-hundred and thirty-one ovitraps were installed monthly, remaining for four days in selected places. Kernel density maps were done to compare the spatiotemporal distribution of collected eggs. Areas which maintained constant oviposition associated with vector activity were identified and were found to overlap the area-clusters with the highest EDI. As viral RNA was not detected, vertical transmission was likely not a maintenance mechanism of arbovirus circulation in Ae. aegypti and Ae. albopictus vectors. This study reiterates the importance, efficiency, and feasibility of ovitraps to monitor the presence and dynamics of Aedes spp. populations.
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Affiliation(s)
- Mario Arturo Acero-Sandoval
- Laboratory of Morphology and Physiology of Culicidae and Chironomidae, Zoology Department, Federal University of Paraná, CP 19020, CEP 81531-980, Curitiba, Paraná, Brazil
| | - Angela Maria Palacio-Cortés
- Laboratory of Morphology and Physiology of Culicidae and Chironomidae, Zoology Department, Federal University of Paraná, CP 19020, CEP 81531-980, Curitiba, Paraná, Brazil
| | - Mario Antônio Navarro-Silva
- Laboratory of Morphology and Physiology of Culicidae and Chironomidae, Zoology Department, Federal University of Paraná, CP 19020, CEP 81531-980, Curitiba, Paraná, Brazil
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Kirstein OD, Talavera GA, Wei Z, Ciau-Carrilo KJ, Koyoc-Cardeña E, Puerta-Guardo H, Rodríguez-Martín E, Medina-Barreiro A, Mendoza AC, Piantadosi AL, Manrique-Saide P, Vazquez-Prokopec GM. Natural Aedes-Borne Virus Infection Detected in Male Adult Aedes aegypti (Diptera: Culicidae) Collected From Urban Settings in Mérida, Yucatán, México. JOURNAL OF MEDICAL ENTOMOLOGY 2022; 59:1336-1346. [PMID: 35535688 PMCID: PMC9278843 DOI: 10.1093/jme/tjac048] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Indexed: 05/12/2023]
Abstract
Aedes-borne viruses (ABVs) such as dengue (DENV), chikungunya (CHIKV), and Zika (ZIKV) contribute significantly to the global burden of infectious diseases, disproportionately affecting disadvantaged populations from tropical and subtropical urban areas. ABVs can be transmitted from female mosquitoes to their progeny by vertical transmission via transovarial and/or trans-egg vertical transmission and contribute to the maintenance of infected-mosquito populations year-round in endemic regions. This study describes the natural infection rate of DENV, CHIKV, and ZIKV in field-caught male Aedes (Sergentomyia) aegypti (Linnaeus) mosquitoes from Mérida, Yucatán, México, as a proxy for the occurrence of vertical virus transmission. We used indoor sequential sampling with Prokopack aspirators to collect all mosquitoes inside houses from ABV hotspots areas. Collections were performed in a DENV and CHIKV post-epidemic phase and during a period of active ZIKV transmission. We individually RT-qPCR tested all indoor collected Ae. aegypti males (1,278) followed by Sanger sequencing analysis for final confirmation. A total of 6.7% male mosquitoes were positive for ABV (CHIKV = 5.7%; DENV = 0.9%; ZIKV = 0.1%) and came from 21.0% (30/143) houses infested with males. Most ABV-positive male mosquitoes were positive for CHIKV (84.8%). The distribution of ABV-positive Ae. aegypti males was aggregated in a few households, with two houses having 11 ABV-positive males each. We found a positive association between ABV-positive males and females per house. These findings suggested the occurrence of vertical arbovirus transmission within the mosquito populations in an ABV-endemic area and, a mechanism contributing to viral maintenance and virus re-emergence among humans in post-epidemic periods.
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Affiliation(s)
- Oscar D Kirstein
- Department of Environmental Sciences. Emory University, Atlanta, GA, USA
| | - Guadalupe Ayora Talavera
- Laboratorio de Virología, Centro de Investigaciones Regionales “Dr. Hideyo Noguchi”, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
| | - Zhuoran Wei
- Department of Environmental Sciences. Emory University, Atlanta, GA, USA
| | - Karina J Ciau-Carrilo
- Laboratorio de Virología, Centro de Investigaciones Regionales “Dr. Hideyo Noguchi”, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
| | - Edgar Koyoc-Cardeña
- Unidad Colaborativa para Bioensayos Entomológicos, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
| | - Henry Puerta-Guardo
- Laboratorio de Virología, Centro de Investigaciones Regionales “Dr. Hideyo Noguchi”, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
- Unidad Colaborativa para Bioensayos Entomológicos, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
| | - Ester Rodríguez-Martín
- Laboratorio de Virología, Centro de Investigaciones Regionales “Dr. Hideyo Noguchi”, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
| | - Anuar Medina-Barreiro
- Unidad Colaborativa para Bioensayos Entomológicos, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
| | - Azael Che Mendoza
- Unidad Colaborativa para Bioensayos Entomológicos, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
| | - Anne L Piantadosi
- Department of Pathology and Laboratory Medicine, Emory University School of Medicine, Atlanta, GA, USA
| | - Pablo Manrique-Saide
- Unidad Colaborativa para Bioensayos Entomológicos, Universidad Autónoma de Yucatán, Mérida, Yucatán, México
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Wijesinghe C, Gunatilake J, Kusumawathie PHD, Sirisena PDNN, Daulagala SWPL, Iqbal BN, Noordeen F. Circulating dengue virus serotypes and vertical transmission in Aedes larvae during outbreak and inter-outbreak seasons in a high dengue risk area of Sri Lanka. Parasit Vectors 2021; 14:614. [PMID: 34949219 PMCID: PMC8705164 DOI: 10.1186/s13071-021-05114-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2020] [Accepted: 12/02/2021] [Indexed: 11/16/2022] Open
Abstract
Background Spatial and temporal changes in the dengue incidence are associated with multiple factors, such as climate, immunity among a population against dengue viruses (DENV), circulating DENV serotypes and vertical transmission (VT) of DENV in an area at a given time. The level of VT in a specific location has epidemiological implications in terms of viral maintenance in vectors. Identification of the circulating DENV serotypes in both patients and Aedes mosquito larvae in an area may be useful for the early detection of outbreaks. We report here the results of a prospective descriptive study that was conducted to detect the levels of VT in Aedes mosquito larvae and circulating DENV serotypes in patients and Aedes mosquito larvae from December 2015 to March 2017 in an area of Sri Lanka at high risk for dengue. Methods A total of 200 patients with clinically suspected dengue who had been admitted to a tertiary care hospital during a dengue outbreak (3 study periods: December 2015–January 2016, June–August 2016, December 2016–January 2017) and in the inter-outbreak periods (February–May 2016 and September–November 2016) were investigated. Blood samples were drawn from the study participants to test for DENV. The houses of the study participants were visited within 7 days of admission to the hospital, and Aedes larvae were also collected within a radius of 400 m from the houses. The larvae were separately identified to species and then pooled according to each patient’s identification number. Patients’ sera and the Aedes larvae were tested to identify the infecting DENV serotypes using a reverse transcription PCR (RT-PCR) method. Levels of VT in Aedes mosquito larvae were also identified. Results All four DENV serotypes (DENV-1 to -4) were identified in the study area. In the early part of the study (December 2015–February 2016), DENV-3 was predominant and from April 2016 to March 2017, DENV-2 became the most predominant type. Four cases of DENV co-infections were noted during the study period in patients. Interestingly, all four DENV serotypes were detected in Aedes albopictus larvae, which was the prominent immature vectorial form identified throughout the study period in the area, showing 9.8% VT of DENV. With the exception of DENV-4, the other three DENV serotypes were identified in Aedes aegypti larvae with a VT of 8.1%. Conclusion Comparatively high rates of VT of DENV was detected in Ae. albopictus and Ae. aegypti larvae. A shift in the predominant DENV serotype with simultaneous circulation of all four DENV serotypes was identified in the study area from December 2015 to March 2017. Graphical Abstract ![]()
Supplementary Information The online version contains supplementary material available at 10.1186/s13071-021-05114-5.
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Affiliation(s)
- Chandana Wijesinghe
- Teaching Hospital Peradeniya, Peradeniya, 20400, Sri Lanka.,Postgraduate Institute of Science, University of Peradeniya, Peradeniya, 20400, Sri Lanka
| | - Jagath Gunatilake
- Postgraduate Institute of Science, University of Peradeniya, Peradeniya, 20400, Sri Lanka.,Department of Geology, Faculty of Science, University of Peradeniya, Peradeniya, 20400, Sri Lanka
| | | | - P D N N Sirisena
- Department of Microbiology, Faculty of Medicine, University of Peradeniya, Peradeniya, 20400, Sri Lanka
| | - S W P L Daulagala
- Department of Microbiology, Faculty of Medicine, University of Peradeniya, Peradeniya, 20400, Sri Lanka
| | - Bushran N Iqbal
- Department of Microbiology, Faculty of Medicine, University of Peradeniya, Peradeniya, 20400, Sri Lanka
| | - Faseeha Noordeen
- Department of Microbiology, Faculty of Medicine, University of Peradeniya, Peradeniya, 20400, Sri Lanka.
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Alves AMB, Costa SM, Pinto PBA. Dengue Virus and Vaccines: How Can DNA Immunization Contribute to This Challenge? FRONTIERS IN MEDICAL TECHNOLOGY 2021; 3:640964. [PMID: 35047911 PMCID: PMC8757892 DOI: 10.3389/fmedt.2021.640964] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2020] [Accepted: 03/17/2021] [Indexed: 01/02/2023] Open
Abstract
Dengue infections still have a tremendous impact on public health systems in most countries in tropical and subtropical regions. The disease is systemic and dynamic with broad range of manifestations, varying from mild symptoms to severe dengue (Dengue Hemorrhagic Fever and Dengue Shock Syndrome). The only licensed tetravalent dengue vaccine, Dengvaxia, is a chimeric yellow fever virus with prM and E genes from the different dengue serotypes. However, recent results indicated that seronegative individuals became more susceptible to develop severe dengue when infected after vaccination, and now WHO recommends vaccination only to dengue seropositive people. One possibility to explain these data is the lack of robust T-cell responses and antibody-dependent enhancement of virus replication in vaccinated people. On the other hand, DNA vaccines are excellent inducers of T-cell responses in experimental animals and it can also elicit antibody production. Clinical trials with DNA vaccines have improved and shown promising results regarding the use of this approach for human vaccination. Therefore, in this paper we review preclinical and clinical tests with DNA vaccines against the dengue virus. Most of the studies are based on the E protein since this antigen is the main target for neutralizing antibody production. Yet, there are other reports with DNA vaccines based on non-structural dengue proteins with protective results, as well. Combining structural and non-structural genes may be a solution for inducing immune responses aging in different infection moments. Furthermore, DNA immunizations are also a very good approach in combining strategies for vaccines against dengue, in heterologous prime/boost regimen or even administering different vaccines at the same time, in order to induce efficient humoral and cellular immune responses.
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Affiliation(s)
- Ada Maria Barcelos Alves
- Laboratory of Biotechnology and Physiology of Viral Infections, Instituto Oswaldo Cruz (IOC), Fundação Oswaldo Cruz (Fiocruz), Rio de Janeiro, Brazil
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