Types of Nosocomial Infections. Urinary tract infections are the most common type of nosocomial infection. In the United States, surgical site infections, bloodstream infections, and pneumonia are the other most common types (WHO, 2012).The location of a nosocomial infection depends on the nature of a patient's hospital procedure.ymptoms of nosocomial infections vary by type. They include inflammation, discharge, fever, and abscesses. Patients may experience pain and irritation at the infection site, and many experience visible symptoms.