More than 20 years ago it was recognized by Stoutenbeek and colleagues that patients in the intensive care unit suffered from infections developed whilst being treated. Moreover, the majority of these infections appeared to originate from bacteria that were acquired in the intensive care leading to pathologic colonisation and overgrowth in the gut, subsequently leading to organ site infections. Selective decontamination of the digestive tract (SDD) is an antibiotic strategy which aims to prevent secondary infections in critically ill patients. This book provides both the scientific rationale and the practical approach to nurses, physicians, pharmacists and microbiologists to design a SDD treatment strategy tailored to each individual patient and the local hospital situation.