Rapid Cavitary Pneumonia and Reversible Hepatic Injury in Burkholderia pseudomallei ST271 Infection

Background:Burkholderia pseudomallei is the causative agent of melioidosis, an infectious disease endemic to tropical and subtropical regions that displays highly variable clinical presentations, ranging from localized abscesses to severe septicemia.Sequence type (ST) 271 has been rarely reported; data concerning its clinical and epidemiological characteristics remain limited.This report describes a rare case of ST271 infection presenting with rapidly progressive cavitary pneumonia and reversible hepatic injury. Case Report:A previously healthy 50-year-old male construction worker from Haikou, China, presented with a 2-week history of intermittent fever, hemoptysis, and persistent cough.Chest computed tomography revealed a thick-walled cavitary mass in the right upper lobe.Laboratory findings demonstrated substantially elevated liver enzymes, indicating acute hepatic injury.Metagenomic sequencing of bronchoalveolar lavage fluid identified B. pseudomallei, and whole-genome sequencing classified the isolate as ST271.The strain was sensitive to imipenem, ceftazidime, and trimethoprim-sulfamethoxazole; preliminary in vitro bacteriophage susceptibility also was observed.After initiation of intravenous ceftazidime followed by oral trimethoprim-sulfamethoxazole, the patient showed rapid clinical improvement that included robust resolution of the pulmonary lesion and normalization of liver enzymes, consistent with reversible hepatic injury. Conclusions:This case highlights the aggressive clinical course of the rare B. pseudomallei ST271 strain, characterized by rapidly progressive cavitary pneumonia and concurrent hepatic injury in an immunocompetent host.Early identification using sequencing techniques facilitated timely targeted therapy and a favorable recovery.The observed in vitro phage susceptibility may provide preliminary insight for future research into alternative management strategies for resistant strains.