The virus began its spread slowly initially but is now gaining momentum . Ebola , SARS and swine flu are just a few of the deadly diseases outbreaks in recent years . Comment: Airborne diseases pose the biggest threat to global health , say experts .
Ebola , SARS and swine flu are just a few of the deadly diseases outbreaks in recent years . Comment: Airborne diseases pose the biggest threat to global health , say experts .