News reporters, scientists, health experts, doctors, etc. said it would take out millions of the population in America.
It hardly did that.
I got H1N1, and I got pneumonia shortly after I got the flu last year.
I didn’t die. Well, obviously.
Anyway, why were people so concerned about it? Why did people say it would kill millions of people?
People seem to always imagine that whatever happens was inevitable, and the experts "should have seen it coming". News media likes to report "breaking news", which means they report things before people know the real facts. And, as has been mentioned, fear sells newspapers.
Where predicting pandemics is concerned, we are where weathermen were when they first put up weather satellites. We can see a storm forming over the gulf, but we can’t tell if it will be a Katrina or just fizzle.
There were a number of hints this MIGHT be a disaster. Flus that have crossed over into humans from animals recently are often much worse. Flu viruses that don’t have surface proteins in common with an older flu are unfamiliar and hard for our immune systems to recognize. Early reports said (incorrectly) that The H1N1 "swine flu" had no surface proteins in common with older flu viruses. The H1N1 "swine flu" had some features in common with the devastating 1918 flu. It had some biological similarities, and like that flu it was more serious for young people then older people. (a rare trait in a flu). Early in the epidemic a bunch of students died in a Mexican High School.
The flu also appeared too late in the season to incorporate the vaccine for it into the normal flu shot.
It turns out that the flu DID have some things in common with a flu that went around decades ago, so old people (normally the group most vulnerable to the flu) had some added protection. Nothing like the incident in the Mexican High School occurred elsewhere, no one knows why.