Isolation and Genomics of multidrug-resistant Brevundimonas diminuta collected from patients with pertussis-like symptoms

Abstract

Brevundinomas diminuta is known as an opportunistic pathogen and is rarely associated with invasive infections in humans causing infection in the different parts of the body. In this study, we identified three B. diminuta isolates from three patients with an initial diagnosis of pertussis. Isolates were confirmed using biochemical tests and 16s rRNA sequencing. All isolates were resistant to three different classes of antimicrobial drugs including ceftazidime and ciprofloxacin. We performed Illumina whole-genome sequencing for two isolates. The results showed an average genome size of 3.25 Mbp with the G+C content 67% with multiple predicted virulence factors and genes leading to antibiotic resistance. We found an open pan-genome with 1502 core genes by analysing 13 available global B. diminuta isolated from different environments such as water, soil, or gentamicin fermentation residue. In the phylogenetic analysis, our isolates were grouped with B. diminuta isolate collected from an oral cavity of a patient in the USA.