Weissella confusa infection in an immunocompromised patient: A case report.

Weissella confusa, a gram-positive, facultative anaerobic bacterium, is typically associated with fermented foods. However, the bacterium is increasingly being linked to various human infections. A 59-year-old woman with a history of type 2 diabetes mellitus, chronic anemia, multiple myeloma, and lymphoma presented with severe back pain, reduced appetite, and swelling. During hospitalization, she developed a fever and was diagnosed with a Weissella confusa infection. Despite antibiotic treatment, the patient's health deteriorated, resulting in her death. Although Weissella confusa is often regarded as a nonpathogenic bacterium, this case underscores the potential pathogenicity of the organism in immunocompromised patients. Adequate identification and understanding of this bacterium are vital to ensure appropriate treatment and management.