The urine samples tested had laboratory confirmed infection with <i>Escherichia coli, Proteus</i>, or <i>Klebsiella</i> bacteria.<h4>Results</h4>The results demonstrated that although the IL-8 levels were variable for the 3 different causative agents of UTI tested, there was a significant difference between no growth samples and combined UTI samples. The gene discussed is CXCL8; the disease is infection.