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Whole Genome Sequencing · Genomic surveillance study
Emerging Microbes & Infections · June 30, 2026
Reinforces what was already believed, rather than introducing something new.
This retrospective analysis of 554 culture-confirmed melioidosis cases in southern China with whole-genome sequencing confirms bacteremia, diabetes mellitus, and pulmonary infection as mortality risk factors, and demonstrates high susceptibility to imipenem and ceftazidime. Phylogenomic analysis reveals 10 evolutionary clusters with Chinese isolates enriched in a clade shared with Thai strains, distinct from Australian-dominated clusters, underscoring regional genetic structuring of B. pseudomallei.
Retrospective cohort study with whole-genome sequencing and phylogenomic analysis. Culture-confirmed melioidosis cases from southern China (2003–2022); predominantly male (86.8%, 481/554), aged 45–64 years (57.7%). Setting: regional surveillance across southern China.. Intervention: Whole-genome sequencing and phylogenomic analysis of B. pseudomallei isolates. Compared with: 3,573 publicly available global B. pseudomallei genomes. n = 554. Southern China; global phylogenomic comparison included strains from Thailand, Australia, and other regions..
Male predominance 86.8% (481/554) and peak incidence 45–64 years (57.7%) Bacteremia associated with mortality: OR=5.91, p<0.001 Diabetes mellitus associated with mortality: OR=2.27, p=0.008
No overall mortality rate or case fatality data reported Bacteremia associated with mortality: OR=5.91, p<0.001
This analysis reinforces bacteremia, diabetes, and pulmonary involvement as critical mortality predictors in melioidosis and confirms first-line antibiotic efficacy (imipenem, ceftazidime). The phylogeographic clustering highlights regional B. pseudomallei diversity and suggests targeted surveillance strategies should account for geographic structuring.
Large retrospective genomic-epidemiological analysis of 554 confirmed cases with whole-genome sequencing confirms known risk factors for melioidosis mortality and antimicrobial susceptibility patterns, with novel phylogeographic clustering data.
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Quoted from the source exactly as published.
This analysis reinforces bacteremia, diabetes, and pulmonary involvement as critical mortality predictors in melioidosis and confirms first-line antibiotic efficacy (imipenem, ceftazidime). The phylogeographic clustering highlights regional B. pseudomallei diversity and suggests targeted surveillance strategies should account for geographic structuring.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
Melioidosis, caused by Burkholderia pseudomallei, is an endemic infectious disease with high mortality in tropical and subtropical regions. Large-scale epidemiological data remain insufficient in China, while comprehensive data integrating genomic epidemiology are rare worldwide. Herein, performed a retrospective analysis of 554 culture-confirmed melioidosis cases in southern China from 2003 to 2022. Genomic characteristics and their relationship with antimicrobial susceptibility and clinical characteristics were analyzed via whole genome sequencing. Core-genome SNP phylogenies were constructed from recombination-masked alignments and compared them with 3,573 publicly available global B. pseudomallei genomes to define their population structure and phylogeographic patterns. Melioidosis predominantly affected male patients (86.8%, 481/554) and those aged 45 -64 years (57.7%). Bacteremia (OR=5.91, p<0.001), diabetes mellitus (OR=2.27, p=0.008), and pulmonary infection (OR=2.26, p=0.005) were identified as risk factors for mortality. Antimicrobial susceptibility testing showed B. pseudomallei exhibited high in vitro susceptibility to imipenem (100%) and ceftazidime (99.6%). Pan-genome analysis confirmed chromosomal functional compartmentalization of the bipartite genome, and genome-wide association study identified high-confidence genetic markers (OR >3 or <0.33) significantly associated with mortality and bacteremia. Furthermore, global phylogenomic analysis identified 10 evolutionary clusters; Chinese isolates were significantly enriched in Cluster 1, a clade shared with Thai strains, and were phylogenetically distinct from Cluster 5, as predominantly composed of Australian isolates. In summary, this large-scale genomic and clinical analysis provides the most comprehensive overview of melioidosis in southern China. The genomic analysis highlighted substantial regional and global genetic diversity, and phylogeographic structuring of B. pseudomallei, underscoring the importance of continued genomic surveillance.
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