Urinary Tract Infection Caused by Lactococcus garvieae in a 75-Year-Old Male Patient With a Complex Medical History

<i>Lactococcus garvieae</i>, a Gram-positive bacterium traditionally associated with infections in fish, has been increasingly recognized as a rare pathogen in human infections, including urinary tract infections (UTIs). We present a case of a 75-year-old male patient with pyohydronephrosis and a complex medical history who was diagnosed with a UTI caused by <i>L. garvieae</i>. The patient was successfully treated with a combination of intravenous ampicillin/sulbactam followed by oral linezolid, resulting in the resolution of symptoms. This report also compares this case with other documented cases of <i>L. garvieae</i> infections, highlighting its pathogenic mechanisms, clinical manifestations, treatment strategies, and the need for heightened awareness of this pathogen.