Cover -- Contents -- Preface -- Introduction: Movement of knowledge -- I Medical knowledge and the political -- 1. Prenatal diagnosis -- 2. The objects of global health policy -- II Circulating and sharing medical knowledge -- 3. Sharing knowledge -- 4. Press releases as medical knowledge -- III Co-creation of medical knowledge -- 5. The ethical tool of informed consent -- 6. The co-creation of situated knowledge -- IV Knowledge in everyday experience -- 7. A number in circulation -- 8. Knowledge worlds apart -- 9. Medicines in the grey market -- List of abbreviations -- About the authors.