Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) What I need to know about My Child's Urinary Tract Infection ?
    ### Response:
    A UTI is an infection in the urinary tract. Infections are caused by microbesorganisms too small to be seen without a microscope. Bacteria * are the most common cause of UTIs. Normally, bacteria that enter the urinary tract are quickly removed by the body before they cause symptoms.
    