What happened to Zika?

Two years ago the world was gripped in a Zika panic as the mosquito-borne virus infected millions and spread across 80 countries. Thousands of babies were born with horrific birth defects after their mothers were infected during pregnancy, resulting in a global health emergency and several travel warnings. But while the Zika virus has now largely fallen off the public's radar and the number of cases have dramatically dropped, scientists say it's premature to dismiss the threat entirely as they warn of further outbreaks. Kathryn Ryan speaks with the co-founder of the Zika Foundation, Dr Michael Callahan, a physician-scientist who specialises in preparation and response to large scale disease outbreaks.