Dengue virus type 4 in Niterói, Rio de Janeiro: the role of molecular techniques in laboratory diagnosis and entomological surveillance

• Published in: Memórias do Instituto Oswaldo Cruz 2013-03, Vol.107 (7)
• Main Authors: de Castro, Márcia Gonçalves, Nogueira, Rita Maria Ribeiro, de Filippis, Ana Maria Bispo, Ferreira, Anielly Alves, Queiroz Lima, Monique da Rocha, da Costa Faria, Nieli Rodrigues, de Bruycker Nogueira, Fernanda, Simões, Jaqueline Bastos Santos, Nunes, Priscila Conrado Guerra, Sampaio, Simone Alves, Lourenço-de-Oliveira, Ricardo, dos Santos, Flávia Barreto
• Format: Article
• Language: English
• Subjects: dengue virus type 4 - Aedes aegypti - RT-PCR - real-time RT-PCR - SimplexaTM Dengue real-time RT-PCR
• ISSN: 1678-8060

In Niterói, state of Rio de Janeiro, dengue virus type 4 (DENV-4) was isolated for the first time in March 2011. We analysed the laboratory findings of the first cases and evaluated the use of molecular techniques for the detection of DENV-4 in Aedes aegypti that were field-caught. Conventional reverse transcriptase-polymerase chain reaction (RT-PCR) and SimplexaTM Dengue real-time RT-PCR confirmed DENV-4 infection in all cases. Additionally, DENV- 4 was confirmed in a female Ae. aegypti with 1.08 x 103 copies/mL of virus, as determined by quantitative real-time RT-PCR. This is the first time the SimplexaTM Dengue real-time assay has been used for the classification of cases of infection and for entomological investigations. The use of these molecular techniques was shown to be important for the surveillance of dengue in humans and vectors.