Vector competence of the Aedes aegypti population from Santiago Island, Cape Verde, to different serotypes of dengue virus
Abstract Background Dengue is an arboviral disease caused by dengue virus (DENV), whose main vectors are the mosquitoes Aedes aegypti and Aedes albopictus. A. aegypti is the only DENV vector in Cape Verde, an African country that suffered its first outbreak of dengue in 2009. However, little is know...
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| Format: | Article |
| Language: | English |
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BMC
2015-02-01
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| Series: | Parasites & Vectors |
| Subjects: | |
| Online Access: | https://doi.org/10.1186/s13071-015-0706-8 |
| _version_ | 1827933685288009728 |
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| author | Aires Januário Fernandes da Moura Maria Alice Varjal de Melo Santos Claudia Maria Fontes Oliveira Duschinka Ribeiro Duarte Guedes Danilo de Carvalho-Leandro Maria Lidia da Cruz Brito Hélio Daniel Ribeiro Rocha Lara Ferrero Gómez Constância Flávia Junqueira Ayres |
| author_facet | Aires Januário Fernandes da Moura Maria Alice Varjal de Melo Santos Claudia Maria Fontes Oliveira Duschinka Ribeiro Duarte Guedes Danilo de Carvalho-Leandro Maria Lidia da Cruz Brito Hélio Daniel Ribeiro Rocha Lara Ferrero Gómez Constância Flávia Junqueira Ayres |
| author_sort | Aires Januário Fernandes da Moura |
| collection | DOAJ |
| description | Abstract Background Dengue is an arboviral disease caused by dengue virus (DENV), whose main vectors are the mosquitoes Aedes aegypti and Aedes albopictus. A. aegypti is the only DENV vector in Cape Verde, an African country that suffered its first outbreak of dengue in 2009. However, little is known about the variation in the level of vector competence of this mosquito population to the different DENV serotypes. This study aimed to evaluate the vector competence of A. aegypti from the island of Santiago, Cape Verde, to four DENV serotypes and to detect DENV vertical transmission. Methods Mosquitoes were fed on blood containing DENV serotypes and were dissected at 7, 14 and 21 days post-infection (dpi) to detect the virus in the midgut, head and salivary glands (SG) using RT-PCR. Additionally, the number of copies of viral RNA present in the SG was determined by qRT-PCR. Furthermore, eggs were collected in the field and adult mosquitoes obtained were analyzed by RT-PCR and the platelia dengue NS1 antigen kit to detect transovarial transmission. Results High rates of SG infection were observed for DENV-2 and DENV-3 whereas for DENV-1, viral RNA was only detected in the midgut and head. DENV-4 did not spread to the head or SG, maintaining the infection only in the midgut. The number of viral RNA copies in the SG did not vary significantly between DENV-2 and DENV-3 or among the different periods of incubation and the various titers of DENV tested. With respect to DENV surveillance in mosquitoes obtained from the eggs collected in the field, no samples were positive. Conclusion Although no DENV positive samples were collected from the field in 2014, it is important to highlight that the A. aegypti population from Santiago Islands exhibited different degrees of susceptibility to DENV serotypes. This population showed a high vector competence for DENV-2 and DENV-3 strains and a low susceptibility to DENV-1 and DENV-4. Viral RNA copies in the SG remained constant for at least 21 dpi, which may enhance the vector capacity of A. aegypti and suggests the presence of a mechanism modulating virus replication in the SG. |
| first_indexed | 2024-03-13T07:28:11Z |
| format | Article |
| id | doaj.art-3864a997965f49839208d528915f7b92 |
| institution | Directory Open Access Journal |
| issn | 1756-3305 |
| language | English |
| last_indexed | 2024-03-13T07:28:11Z |
| publishDate | 2015-02-01 |
| publisher | BMC |
| record_format | Article |
| series | Parasites & Vectors |
| spelling | doaj.art-3864a997965f49839208d528915f7b922023-06-04T11:14:58ZengBMCParasites & Vectors1756-33052015-02-01811910.1186/s13071-015-0706-8Vector competence of the Aedes aegypti population from Santiago Island, Cape Verde, to different serotypes of dengue virusAires Januário Fernandes da Moura0Maria Alice Varjal de Melo Santos1Claudia Maria Fontes Oliveira2Duschinka Ribeiro Duarte Guedes3Danilo de Carvalho-Leandro4Maria Lidia da Cruz Brito5Hélio Daniel Ribeiro Rocha6Lara Ferrero Gómez7Constância Flávia Junqueira Ayres8Departamento de Entomologia, Centro de Pesquisas Aggeu Magalhães (CPqAM)Departamento de Entomologia, Centro de Pesquisas Aggeu Magalhães (CPqAM)Departamento de Entomologia, Centro de Pesquisas Aggeu Magalhães (CPqAM)Departamento de Entomologia, Centro de Pesquisas Aggeu Magalhães (CPqAM)Departamento de Entomologia, Centro de Pesquisas Aggeu Magalhães (CPqAM)Unidade de Ciências da Natureza, da Vida e do AmbienteDepartamento de Entomologia, Centro de Pesquisas Aggeu Magalhães (CPqAM)Unidade de Ciências da Natureza, da Vida e do AmbienteDepartamento de Entomologia, Centro de Pesquisas Aggeu Magalhães (CPqAM)Abstract Background Dengue is an arboviral disease caused by dengue virus (DENV), whose main vectors are the mosquitoes Aedes aegypti and Aedes albopictus. A. aegypti is the only DENV vector in Cape Verde, an African country that suffered its first outbreak of dengue in 2009. However, little is known about the variation in the level of vector competence of this mosquito population to the different DENV serotypes. This study aimed to evaluate the vector competence of A. aegypti from the island of Santiago, Cape Verde, to four DENV serotypes and to detect DENV vertical transmission. Methods Mosquitoes were fed on blood containing DENV serotypes and were dissected at 7, 14 and 21 days post-infection (dpi) to detect the virus in the midgut, head and salivary glands (SG) using RT-PCR. Additionally, the number of copies of viral RNA present in the SG was determined by qRT-PCR. Furthermore, eggs were collected in the field and adult mosquitoes obtained were analyzed by RT-PCR and the platelia dengue NS1 antigen kit to detect transovarial transmission. Results High rates of SG infection were observed for DENV-2 and DENV-3 whereas for DENV-1, viral RNA was only detected in the midgut and head. DENV-4 did not spread to the head or SG, maintaining the infection only in the midgut. The number of viral RNA copies in the SG did not vary significantly between DENV-2 and DENV-3 or among the different periods of incubation and the various titers of DENV tested. With respect to DENV surveillance in mosquitoes obtained from the eggs collected in the field, no samples were positive. Conclusion Although no DENV positive samples were collected from the field in 2014, it is important to highlight that the A. aegypti population from Santiago Islands exhibited different degrees of susceptibility to DENV serotypes. This population showed a high vector competence for DENV-2 and DENV-3 strains and a low susceptibility to DENV-1 and DENV-4. Viral RNA copies in the SG remained constant for at least 21 dpi, which may enhance the vector capacity of A. aegypti and suggests the presence of a mechanism modulating virus replication in the SG.https://doi.org/10.1186/s13071-015-0706-8DengueRT-PCRVectorNS1 antigenCape Verde |
| spellingShingle | Aires Januário Fernandes da Moura Maria Alice Varjal de Melo Santos Claudia Maria Fontes Oliveira Duschinka Ribeiro Duarte Guedes Danilo de Carvalho-Leandro Maria Lidia da Cruz Brito Hélio Daniel Ribeiro Rocha Lara Ferrero Gómez Constância Flávia Junqueira Ayres Vector competence of the Aedes aegypti population from Santiago Island, Cape Verde, to different serotypes of dengue virus Parasites & Vectors Dengue RT-PCR Vector NS1 antigen Cape Verde |
| title | Vector competence of the Aedes aegypti population from Santiago Island, Cape Verde, to different serotypes of dengue virus |
| title_full | Vector competence of the Aedes aegypti population from Santiago Island, Cape Verde, to different serotypes of dengue virus |
| title_fullStr | Vector competence of the Aedes aegypti population from Santiago Island, Cape Verde, to different serotypes of dengue virus |
| title_full_unstemmed | Vector competence of the Aedes aegypti population from Santiago Island, Cape Verde, to different serotypes of dengue virus |
| title_short | Vector competence of the Aedes aegypti population from Santiago Island, Cape Verde, to different serotypes of dengue virus |
| title_sort | vector competence of the aedes aegypti population from santiago island cape verde to different serotypes of dengue virus |
| topic | Dengue RT-PCR Vector NS1 antigen Cape Verde |
| url | https://doi.org/10.1186/s13071-015-0706-8 |
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