January 15, 2026
US-Funded Hepatitis B Vaccine Trial in Guinea-Bissau Halted Amid Ethics Concerns
A $1.6 million US-funded hepatitis B vaccine trial in Guinea-Bissau has been stopped due to ethical issues. Africa CDC confirmed the study’s cancellation, calling the design problematic. Debate continues on how to run the trial fairly, with new plans expected to address ethics before moving forward.