<prompt> In a surgical patient, the causes of non-surgical infection are all exceptLower respiratory tract infectionWound infectionClostridium difficile diarrheaUTI  <response>: Hospital acquired Infection HAI Infection that follows surgery or admission to hospital Common HAI are 1. Respiratory infectionsincluding ventilator associated pneumonia 10-15 2. UTImostly related to urinary catheters 30-40MC 3.Bacteraemia mostly related to indwelling vascular catheters 10-15 Surgical site infections 15-202nd most common Antibiotic associated diarrhea, caused by clostridium difficle 5-10 Ref: Sabiston 20th edition Pgno :322-323 