Occurrence of natural vertical transmission of dengue-2 and dengue-3 viruses in Aedes aegypti and Aedes albopictus in Fortaleza, Ceará, Brazil.

<h4>Background</h4>Aedes aegypti and Aedes albopictus perform an important role in the transmission of the dengue virus to human populations, particularly in the tropical and subtropical regions of the world. Despite a lack of understanding in relation to the maintenance of the dengue vi...

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Autores principales:	Victor Emanuel Pessoa Martins, Carlos Henrique Alencar, Michel Toth Kamimura, Fernanda Montenegro de Carvalho Araújo, Salvatore Giovanni De Simone, Rosa Fireman Dutra, Maria Izabel Florindo Guedes
Formato:	article
Lenguaje:	EN
Publicado:	Public Library of Science (PLoS) 2012
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/7bfa2fe70dee41c0b4a9db4d7b6ace58
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spelling	oai:doaj.org-article:7bfa2fe70dee41c0b4a9db4d7b6ace582021-11-18T07:11:09ZOccurrence of natural vertical transmission of dengue-2 and dengue-3 viruses in Aedes aegypti and Aedes albopictus in Fortaleza, Ceará, Brazil.1932-620310.1371/journal.pone.0041386https://doaj.org/article/7bfa2fe70dee41c0b4a9db4d7b6ace582012-01-01T00:00:00Zhttps://www.ncbi.nlm.nih.gov/pmc/articles/pmid/22848479/pdf/?tool=EBIhttps://doaj.org/toc/1932-6203<h4>Background</h4>Aedes aegypti and Aedes albopictus perform an important role in the transmission of the dengue virus to human populations, particularly in the tropical and subtropical regions of the world. Despite a lack of understanding in relation to the maintenance of the dengue virus in nature during interepidemic periods, the vertical transmission of the dengue virus in populations of A. aegypti and A. albopictus appears to be of significance in relation to the urban scenario of Fortaleza.<h4>Methods</h4>From March 2007 to July 2009 collections of larvae and pupae of Aedes spp were carried out in 40 neighborhoods of Fortaleza. The collections yielded 3,417 (91%) A. aegypti mosquitoes and 336 (9%) A. albopictus mosquitoes. Only pools containing females, randomly chosen, were submitted to the following tests indirect immunofluorescence (virus isolation), RT-PCR/nested-PCR and nucleotide sequencing at the C-prM junction of the dengue virus genome.<h4>Results</h4>The tests on pool 34 (35 A. albopictus mosquitoes) revealed with presence of DENV-3, pool 35 (50 A. aegypti mosquitoes) was found to be infected with DENV-2, while pool 49 (41 A. albopictus mosquitoes) revealed the simultaneous presence of DENV-2 and DENV-3. Based on the results obtained, there was a minimum infection rate of 0.5 for A. aegypti and 9.4 for A. albopictus. The fragments of 192 bp and 152 bp related to DENV-3, obtained from pools 34 and 49, was registered in GenBank with the access codes HM130699 and JF261696, respectively.<h4>Conclusions</h4>This study recorded the first natural evidence of the vertical transmission of the dengue virus in populations of A. aegypti and A. albopictus collected in Fortaleza, Ceará State, Brazil, opening a discuss on the epidemiological significance of this mechanism of viral transmission in the local scenario, particularly with respect to the maintenance of these viruses in nature during interepidemic periods.Victor Emanuel Pessoa MartinsCarlos Henrique AlencarMichel Toth KamimuraFernanda Montenegro de Carvalho AraújoSalvatore Giovanni De SimoneRosa Fireman DutraMaria Izabel Florindo GuedesPublic Library of Science (PLoS)articleMedicineRScienceQENPLoS ONE, Vol 7, Iss 7, p e41386 (2012)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Victor Emanuel Pessoa Martins Carlos Henrique Alencar Michel Toth Kamimura Fernanda Montenegro de Carvalho Araújo Salvatore Giovanni De Simone Rosa Fireman Dutra Maria Izabel Florindo Guedes Occurrence of natural vertical transmission of dengue-2 and dengue-3 viruses in Aedes aegypti and Aedes albopictus in Fortaleza, Ceará, Brazil.
description	<h4>Background</h4>Aedes aegypti and Aedes albopictus perform an important role in the transmission of the dengue virus to human populations, particularly in the tropical and subtropical regions of the world. Despite a lack of understanding in relation to the maintenance of the dengue virus in nature during interepidemic periods, the vertical transmission of the dengue virus in populations of A. aegypti and A. albopictus appears to be of significance in relation to the urban scenario of Fortaleza.<h4>Methods</h4>From March 2007 to July 2009 collections of larvae and pupae of Aedes spp were carried out in 40 neighborhoods of Fortaleza. The collections yielded 3,417 (91%) A. aegypti mosquitoes and 336 (9%) A. albopictus mosquitoes. Only pools containing females, randomly chosen, were submitted to the following tests indirect immunofluorescence (virus isolation), RT-PCR/nested-PCR and nucleotide sequencing at the C-prM junction of the dengue virus genome.<h4>Results</h4>The tests on pool 34 (35 A. albopictus mosquitoes) revealed with presence of DENV-3, pool 35 (50 A. aegypti mosquitoes) was found to be infected with DENV-2, while pool 49 (41 A. albopictus mosquitoes) revealed the simultaneous presence of DENV-2 and DENV-3. Based on the results obtained, there was a minimum infection rate of 0.5 for A. aegypti and 9.4 for A. albopictus. The fragments of 192 bp and 152 bp related to DENV-3, obtained from pools 34 and 49, was registered in GenBank with the access codes HM130699 and JF261696, respectively.<h4>Conclusions</h4>This study recorded the first natural evidence of the vertical transmission of the dengue virus in populations of A. aegypti and A. albopictus collected in Fortaleza, Ceará State, Brazil, opening a discuss on the epidemiological significance of this mechanism of viral transmission in the local scenario, particularly with respect to the maintenance of these viruses in nature during interepidemic periods.
format	article
author	Victor Emanuel Pessoa Martins Carlos Henrique Alencar Michel Toth Kamimura Fernanda Montenegro de Carvalho Araújo Salvatore Giovanni De Simone Rosa Fireman Dutra Maria Izabel Florindo Guedes
author_facet	Victor Emanuel Pessoa Martins Carlos Henrique Alencar Michel Toth Kamimura Fernanda Montenegro de Carvalho Araújo Salvatore Giovanni De Simone Rosa Fireman Dutra Maria Izabel Florindo Guedes
author_sort	Victor Emanuel Pessoa Martins
title	Occurrence of natural vertical transmission of dengue-2 and dengue-3 viruses in Aedes aegypti and Aedes albopictus in Fortaleza, Ceará, Brazil.
title_short	Occurrence of natural vertical transmission of dengue-2 and dengue-3 viruses in Aedes aegypti and Aedes albopictus in Fortaleza, Ceará, Brazil.
title_full	Occurrence of natural vertical transmission of dengue-2 and dengue-3 viruses in Aedes aegypti and Aedes albopictus in Fortaleza, Ceará, Brazil.
title_fullStr	Occurrence of natural vertical transmission of dengue-2 and dengue-3 viruses in Aedes aegypti and Aedes albopictus in Fortaleza, Ceará, Brazil.
title_full_unstemmed	Occurrence of natural vertical transmission of dengue-2 and dengue-3 viruses in Aedes aegypti and Aedes albopictus in Fortaleza, Ceará, Brazil.
title_sort	occurrence of natural vertical transmission of dengue-2 and dengue-3 viruses in aedes aegypti and aedes albopictus in fortaleza, ceará, brazil.
publisher	Public Library of Science (PLoS)
publishDate	2012
url	https://doaj.org/article/7bfa2fe70dee41c0b4a9db4d7b6ace58
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Occurrence of natural vertical transmission of dengue-2 and dengue-3 viruses in Aedes aegypti and Aedes albopictus in Fortaleza, Ceará, Brazil.

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