The term nosocomial can apply to that type of a disease that is acquired by a patient when he is under medical care. These types of infections are also known as HAI grow into patients when he stays at the hospital and taken supplementary types of medical facilities. It can be appeared in both cases either during hospitalization or after the time of discharge. Pathogens which are a major basis of such infections are called nosocomial pathogens. Worldwide, in healthcare systems, urinary tract infections are the most common complications. According to recent data, 30% of Nosocomial infections related to UT are caused by gram-negative bacteria.