Characterization of Vibrio cholerae from the Jukskei River in Johannesburg, South Africa.

Abstract

The current study aimed to isolate and characterize Vibrio cholerae isolated from the Jukskei River, one of the largest Rivers in Johannesburg, South Africa. Water samples collected from the Jukskei River were subjected to culture-based methods for the detection and isolation of V. cholerae. Twenty-four V. cholerae were isolated, confirmed using real-time PCR, and sequenced using the MInION portable nanopore-sequencing device. Reference-based genome assemblies were constructed from the raw reads using the EPI2ME software followed by bioinformatics analysis using the Centre for Genomic Epidemiology website. All the V. cholerae isolates isolated from the Jukskei River were classified as non-O1/non-O139 and none of the isolates harbored the cholera toxin gene, ctxA. All 24 V. cholerae isolates belonged to sequence type 741, virulent genes including toxR, vspD, als, hlyA, makA, and rtxA as well as the Vibrio pathogenicity island 2 were detected amongst the isolates. Antimicrobial resistance genes (parC, varG, and gyrA) were detected in 83% of isolates. Although V. cholerae non-O1/non-O139 are not associated with epidemic cholera they can still cause mild to life-threatening illnesses. Therefore, increased surveillance should be considered to better understand the public health risks to the local community.