US health officials insisted it was still on. African health leaders said it was cancelled. At the heart of the controversy is the west African nation of Guinea-Bissau – one of the poorest countries in the world and the proposed site of a hotly debated US-funded study on vaccines.
The study on hepatitis B vaccination, to be led by Danish researchers, became a flashpoint after major changes to the US vaccination schedule and prompted questions about how research is conducted ethically in other countries.
