Guinea-Bissau pauses Danish-led vaccine study over ethical concerns

Guinea-Bissau's minister of health announced Thursday that the country was halting a controversial Danish-led, US-funded trial of a hepatitis B vaccine. The West African country says there are ethical concerns with the study and that the pause is a matter of sovereignty. The World's Marco Werman learns more about the controversy from Boghuma Titanji (MD), an expert in infectious diseases at Emory University's School of Medicine.