Microbiology and Pathophysiology of Diabetic Foot Ulcers: Insights into Biofilm-Mediated Chronic Infection

Abstract

Diabetic foot ulcers (DFUs) represent a major, costly complication of chronic diabetes mellitus. DFUs often precede lower-extremity amputations. The development of chronic DFUs is driven by a complex interplay of underlying pathophysiology. This is primarily represented by peripheral neuropathy and macro/micro-angiopathy. This would compromise tissue integrity and host immunity. These pathological changes create an optimal environment for persistent poly microbial infection. This is critically sustained by the formation of highly protected bacterial biofilms. This review comprehensively details the mechanisms of DFU pathogenesis, the evolving microbial etiology, and the pivotal role of the biofilm matrix in mediating enhanced antimicrobial tolerance. A clear understanding of the synergistic relationship between impaired host defenses and biofilm persistence is essential for developing holistic, targeted management strategies. This incorporates aggressive debridement and novel anti-biofilm agents.