Urinary Tract Infections in Children, What is a urinary tract infection?, How is a UTI treated? Thehealthtime.com Urinary Tract Infections in Children What is a urinary tract infection? A urinary tract infection (UTI) is an infection in the urinary tract. The urinary tract includes the kidneys, the bladder and the urethra. The kidneys are 2 bean-shaped organs that lie against the spine in the lower back. As blood flows through the kidneys, waste is removed...