Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Urinary Tract Infection In Adults ?
    ### Response:
    A UTI is an infection in the urinary tract. Infections are caused by microbesorganisms too small to be seen without a microscopeincluding fungi, viruses, and bacteria. Bacteria are the most common cause of UTIs. Normally, bacteria that enter the urinary tract are rapidly removed by the body before they cause symptoms.
    