Lil - it can come from surgical insruments as well. It's such a hard one to keep track of at times. It's one of the reasons us nurses are so intense with hand washing and why we have all these checks in theatre to make sure things are sterilised properly. But unfortunatly as with anything in life, errors happen... Many infections also happen because the natural flora on the skin can actually cause infections in wounds! Infection control is one of my pet things. There is so much to know though!

Love MG