The Genomic Epidemiology of Clinical Burkholderia pseudomallei Isolates in North Queensland, Australia

• Published in: Pathogens (Basel) 2024-07, Vol.13 (7), p.584
• Main Authors: Gassiep, Ian, Chatfield, Mark D, Permana, Budi, Burnard, Delaney, Bauer, Michelle J, Cuddihy, Thom, Forde, Brian M, Mayer-Coverdale, Johanna, Norton, Robert E, Harris, Patrick N A
• Format: Article
• Language: English
• Subjects: Alcohol use; Burkholderia pseudomallei; Clinical isolates; Epidemiology; Fatalities; Gene sequencing; Genetic analysis; Genetic diversity; Genomes; Genomics; Genotypes; Geographical locations; Hospitals; Melioidosis; Mortality; Motility; multilocus sequence type; Nucleotide sequence; Pneumonia; Regression analysis; Risk analysis; Risk factors; Virulence; Virulence factors; Whole genome sequencing
• ISSN: 2076-0817; 2076-0817
• DOI: 10.3390/pathogens13070584

, the causative agent of melioidosis, is highly genetically recombinant, resulting in significant genomic diversity. Multiple virulence factors have been associated with specific disease presentations. To date, there are limited data relating to genomic diversity and virulence factors associated with melioidosis cases in North Queensland, Australia. To describe the genetic diversity of and identify virulence factors associated with clinical risk factors and patient outcomes. Whole genome sequencing of clinical isolates was performed and analysed with clinical data obtained from a retrospective melioidosis cohort study. Fifty-nine distinct sequence types (STs) were identified from the 128 clinical isolates. Six STs comprised 64/128 (50%) isolates. Novel STs accounted for 38/59 (64%) STs, with ST TSV-13 as the most prevalent (n = 7), and were less likely to possess an LPS A genotype or YLF gene cluster ( < 0.001). These isolates were most likely to be found outside the inner city (aOR: 4.0, 95% CI: 1.7-9.0, = 0.001). ST TSV-13 was associated with increased mortality (aOR: 6.1, 95% CI: 1.2-30.9, = 0.03). Patients with a history of alcohol excess were less likely to be infected by 3 (aOR 0.2, 95% CI: 0.1-0.7, = 0.01) or YLF (aOR: 0.4, 95% CI: 0.2-0.9, = 0.04) positive isolates. There are a significant number of novel sequence types in Townsville, Australia. An emerging novel ST appears to have an association with geographic location and mortality. Ongoing investigation is required to further understand the impact of this ST on the Townsville region.