Aerococcus urinae is a Gram-positive bacterium associated with urinary tract infections.

[2] Later, it was found in the urine of patients with urinary tract infections[3] and in 1992, A. urinae was assigned as distinct species.

[4] Due to difficulties in the biochemical identification of A. urinae in clinical microbiological laboratories, the incidence of infections with this bacterium has likely been underestimated and secure identification relies on genetic techniques like 16S ribosomal subunit sequencing or mass spectroscopic methods such as MALDI-TOF.

[5] A. urinae may also cause invasive infections including sepsis originating from the urinary tract and infective endocarditis, especially in elderly men with underlying urinary tract diseases.

[8] The bacterium can form biofilms on foreign materials and can aggregate human platelets, two features of potential importance for the disease causing capacity of this organism.