Abstractobjective To present results of virological surveillance and epidemiological aspects of dengue in the State of Rio Grande do Norte, Brazil.methods A total of 1581 cases, reported from 2010 to 2012 at various health centres in the state, were analysed by viral isolation and/or RT-PCR for viral detection and typing. To identify whether different genotypes were circulating in the state during this period, sequencing of the complete E gene for DENV (1485 bp in length) was performed directly from patient serum samples.

The first detection of Culex flavivirus (CxFV) in mosquitoes was described in 2007 in Japan and subsequently in different areas of the Americas, Africa, and Asia. In this study, we report the identification of CxFV in Culex (Culex) chidesteri Dyar, 1921 mosquitoes collected in the Açu National Forest - FLONA/ AÇU-RN, a preserved area of Biome Caatinga, State of Rio Grande do Norte, Brazil. We performed nucleotide-sequencing analysis in order to compare with other previously identified CxFV collected from around the world. A total of 129 samples (pools of ≤30 female mosquitoes) were processed for generic reverse transcriptase PCR assay. CxFV infection was identified in only two pools from Culex chidesteri. Our phylogenetic analysis revealed that the AssuCxFV identified in this study belongs to the Africa/Caribbean/South America Subtype. Our study represents the first report of the CxFV from a natural Culex chidesteri population.