RESUMO

ABSTRACT The emergence of insecticide resistance in different mosquito populations underscores the pressing need for alternative approaches to control vector-borne diseases. Among several technological strategies, the employment of bacterial symbionts, such as the Wolbachia pipientis strains wMel and wAlbB to inhibit the ability of Aedes aegypti (Linnaeus, 1762) to transmit dengue and Zika viruses in endemic regions worldwide is promising. This investigation examines both the bacterial diversity associated with Culex quinquefasciatus and the genetic diversity of Wolbachia in females collected in Coari, Amazonas State, Brazil. Both 16S rRNA and Wolbachia surface protein (wsp) gene sequences were generated and examined. Proteobacteria was the dominant phylum. Wolbachia was the predominant genus, followed by Providencia, unclassified Erwiniaceae, and Acinetobacter. The presence of Delftia in Cx. quinquefasciatus need further investigations to identify the strains and if any of them can inhibit the transmission of arboviruses by this mosquito. Wolbachia 16S rRNA sequences were detected in all samples analyzed. The wsp sequences from Coari specimens were identified as Wolbachia wPip strain of the supergroup B. These sequences are identical and share 100% similarity with those of other Cx. quinquefasciatus populations from Brazil. Our findings suggest the hypothesis of previous studies that the Wolbachia invasion in Cx. quinquefasciatus was recent.