Despite US pushback, officials in west Africa say controversial hepatitis B study on pause amid ethics concerns US health officials insisted it was still on. African health leaders said it was . 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.
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