9. The Hong Kong Flu
Another Asian Flu, this time originating in Hong Kong. The first case was reported on the 13th of July 1968. It took only 17 days before outbreaks of this H3N2 strain of the Influenza A virus, a genetic offshoot of the H2N2 subtype, were reported in Singapore and Vietnam, and within three months it had spread to The Philippines, India, Australia, Europe, and the United States.
It resulted in the deaths of more than a million people, including 500,000 residents of Hong Kong, approximately 15% of its population at the time.
10. HIV/AIDS Pandemic
Since its first identification in the Democratic Republic of the Congo in 1976, HIV/AIDS has truly become a global pandemic, claiming the lives of more than 36 million people since 1981. Striking hardest in Sub-Saharan Africa where it has infected 5% of the population, approximately 21 million people.
With new treatments and greater awareness, many of the deaths have been avoided, dropping globally from 2.2 million to 1.6 million between 2005 and 2012. Currently, there are between 31 and 35 million people living with HIV across the world.