Bandim Health Project said a planned hepatitis B birth-dose trial will not go ahead after judicial police in Guinea-Bissau raided facilities and seized hepatitis B vaccine doses during a dispute involving research on African newborns. Officials said the seizure was meant to clarify circumstances around vaccine batches rather than to indicate quality or effectiveness irregularities. Regulatory engagement described in the case included ethics approvals from Guinea-Bissau and Denmark, but the country’s transitional government and health ministry representatives disputed that the trial would proceed. The development directly affects a critical prevention window for newborns, where vaccination within 24 hours is widely recognized as a key public health intervention.