Melioidosis and Burkholderia pseudomallei: Disease mechanisms, drug resistance, and treatment challenges

Melioidosis, which is often referred to as Whitmore’s illness, is a potentially fatal infection that arises from the environmental Gram-negative bacillus Burkholderia pseudomallei . These bacteria can have a fatality rate of up to 40% and are typically characterized by numerous abscesses and pneumonia. Functional neutrophil defects, often linked to risk factors like diabetes, may significantly contribute to the pathophysiology of melioidosis. Research has identified virulence factor, such as type III secretion system, which enables phagocytes to evade killing mechanisms. While cell-mediated immunity may play a role, repeated environmental exposure does not lead to the development of protective humoral or cellular immunity. A vaccine is being developed for the same; however, in many endemic places, vaccination may not be a feasible option due to financial constraints. The signs and symptoms of these diseases are unpredictable, and there are currently no speedy, practical, affordable, or reliable diagnostic tools in the market; instead, diagnosis majorly relies on the culture of the organism. Even with the development of intravenous ceftazidime and carbapenem therapies, severe sepsis and its consequences remain a major cause of mortality in melioidosis cases. To prevent recurrence, a prolonged course of oral medication aimed at complete eradication is required. To lessen the impact of this illness, research on the importance of prophylactic interventions, early clinical detection, and improved care of severe sepsis is needed.