Why was the influenza pandemic of 1918 a significant event following world war 1

It kept Germany from recovering socially or economically from the war - apex

The 'Spanish' Influenza pandemic and its relation to World War I. A world-wide epidemic caused by influenza viruses led to between 50 and 100 million deaths in 1918 and 1919 (as much as 1 of every 18 people) ... And unlike typical flu pandemics it disproportionately killed young healthy adults.