Dont forget that in 1918 many people were malnourished, TB was rife leaving those who survivied with lung weaknesses, housing was overcrowding with poor sanitation, many people, even the wealthier ones suffered from poor nutrition and many young men coming back from the war had lung conditions from being gassed. Children often didn't survive past five, and those who did worked down mines, in cotton mills etc and had weakened lungs. It was a very different time.
Humankind have an uncanny knack of adapting and coping. We survived the 1918 outbreak and we will survive the 2009 one... if it comes. I refuse to live my life in fear of what might happen. For me the worst already has and I go on savouring every moment, living for today to the fullest extent possible for as long as I can.