| Summary: | <i>Lactococcus petauri</i> is a recently described species of the genus <i>Lactococcus</i>. It was reported as an etiological agent of piscine lactococcosis together with <i>Lactococcus garvieae</i>. <i>L. garvieae</i> was already described as an opportunistic pathogen in human infections, with a potential zoonotic role. This paper represents the first report of a human urinary tract infection caused by <i>L. petauri</i>. A 91-year-old man was admitted to the emergency department for a femur fracture consequent to a domestic accident. The fracture was reduced by surgery and a catheterized specimen urine culture revealed a high bacterial load sustained by Gram-positive cocci, identified by Vitek 2 compact as <i>L. garvieae</i>, and subsequently as <i>L. petauri</i> through Internal Transcribed spacer 16S-23S r-RNA amplification. The number of <i>L. petauri</i> infections in humans is expected to rise in the near future mainly due to diagnostic improvement. A dedicated survey on <i>L. garvieae</i> and <i>L. petauri</i> infections in humans should be performed to better understand their role as pathogens and as zoonotic agents.
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