On February 1, 2016, the World Health Organization declared Zika virus a Public Health Emergency of International Concern with the virus' continued spread through the Americas. Zika, which was previously considered to be fairly harmless, has been linked to birth defects and miscarriages in a dramatic shift that scientists are unable to explain. However, we are now one step closer to understanding this virus as the development of a new mouse model may have solved one piece of the puzzle. Connie Orbach spoke to lead researcher Michael Diamond from Washington University in St Louis. Like this podcast? Please help us by supporting the Naked Scientists