3D Model of an Influenza Virus. The Hemagglutinin (HA) and Neuraminidase (NA) proteins are shown on the surface, and are used to describe different types of Influenza viruses
Source: Public Domain (wikipedia.org)
Chart showing the "W Curve" of Spanish Flu mortality, which disproportionally affected healthy young adults
Source: Public Domain
Chart showing the three pandemic waves in 1918-1919 through weekly combined influenza and pneumonia mortality, United Kingdom
Source: Public Domain CDC
