Ebola. Zika. Both diseases that were unknown to many until recently. But there have been huge outbreaks of both - and each time scientists and global health experts were caught off guard.
In this week's Scrubbing Up, Dr Seth Berkley, CEO of the Gavi, the Vaccine Alliance suggests Ebola and Zika may be followed by other public health emergencies fuelled by other lesser-known diseases.
Also read: Four new cases of Zika reported Thursday