The 1918 Influenza Pandemic was the most severe Pandemic in recent history.
The number of deaths was estimated to be a.
It is estimated that about 500 million people or one-third of the world\'s population became infected with this virus.
In the United States, it was first identified in military personnel in spring 1918.
Although there is not universal consensus regarding where the virus originated, it spread worldwide during 1918-1919.
It was caused by an H1N1 virus with genes of avian origin.
The 1918 Influenza Pandemic was the most severe Pandemic in recent history