<prompt> Which of the following causes highest risk of nosocomial infection to a patient -Patient admitted for elective surgeryHIV patient coming in follow up OPDPatient undergoing endoscopyPatient admitted for normal delivery  <response>: Most common nosocomial infection Urinary tract infection.Most of the nosocomial UTIs occur after urinary catheterization.Second most common nosocomial infection Pneumonia.Most of the nosocomial pneumonia are acquire through respiratory intubation, mechanical ventilation and suction of the material from the mouth.Next most common cause of nosocomial infection Surgical procedures.Surgical procedures increase a patients risk of getting an infection in the hospital. Surgery directly invades the patients body giving bacteria a way into normally sterile parts of the body.An infection may be acquired from contaminated surgical equipment or from health-care workers. Following surgery, the surgical wound can become infected. 