`` The world is unprepared , '' stated WHO director general Margaret Chan at a session alongside Peter Piot in Davos . However , SARS and bird flu are just a few of the deadly diseases emerging in recent years . Global networks provide early warning of potential outbreaks . Airborne diseases are the biggest threat to global health , say experts .
However , SARS and bird flu are just a few of the deadly diseases emerging in recent years . Global networks provide early warning of potential outbreaks . Airborne diseases are the biggest threat to global health , say experts .