Rare Pathogen in Diabetic Foot Gangrene: A Case of Wohlfahrtiimonas chitiniclastica Infection.

Wohlfahrtiimonas chitiniclastica is a rare Gram-negative bacterium typically associated with wound infections, particularly in immunocompromised patients or individuals exposed to unsanitary conditions. Although clinical cases are infrequent, the infection can lead to severe complications such as bacteremia, septic shock, and even death if unrecognized or inadequately treated. We present the case of a 76-year-old diabetic male who developed chronic, non-healing foot ulcers complicated by gangrene and maggot infestation. Diagnostic challenges were addressed using metagenomic next-generation sequencing, which identified W. chitiniclastica alongside Proteus mirabilis and Corynebacterium striatum. Management included aggressive surgical debridement to remove necrotic tissue, local application of gentamicin-impregnated bone cement, systemic antibiotic therapy with ertapenem, and wound reconstruction using a dorsally based fascial flap. This combined approach resulted in significant clinical improvement, progressive wound healing, and marked reductions in infection markers. The case highlights the decisive role of advanced sequencing technologies in identifying rare pathogens within polymicrobial infections, where conventional methods such as MALDI-TOF mass spectrometry may fail. It also emphasizes the importance of integrating precision diagnostics with surgical intervention, targeted antimicrobial therapy, and rigorous postoperative care to achieve successful outcomes. By documenting this unusual presentation, we aim to expand clinical awareness of W. chitiniclastica infections and provide a practical framework for managing similarly complex diabetic foot infections.