Aerococcus urinae is a type of bacteria that can lead to infections in the urinary system. This work describes a 73 year old man who had an infection with Aerococcus urinae. Samples of blood and urine were taken from the patient, and when put on blood cells the bacteria weakly changed the color of the blood cells around them. This result is called alpha hemolysis, and can be seen in Image 1. Adding Gram stain to the bacteria turned them violet, and therefore the bacteria were Gram-positive. This can be seen in microscopy in Image 2. The patient was treated with antibiotics.