An estimated one third of the world’s population (or about 500 million persons) were infected and had clinically apparent illnesses during the 1918–1919 influenza pandemic. The disease was exceptionally severe. Case-fatality rates were greater than 2.5%, compared to less than 0.1% in other influenza pandemics. Total deaths were estimated at 50 million and were arguably as high as 100 million. –US Centers for Disease Control, 2006

About
of people around the world became sick during the pandemic.

According to the Seattle Times article, the disease killed as many as
people.

The information from this CDC article
the facts in the Seattle Times article.