At the beginning of the twentieth century, it was just a small scratch that could kill you, despite the best treatments available.
The situation has changed with the invention of antibiotics.
For a moment, imagine humans that the battle with bacteria is over, But the bacteria had another opinion. I've developed, resisted antibiotics.
It's like we produced Super Hero and Super Feline at the same moment.
And for a while, everyone is afraid of a future as antibiotics might unable to protect you from just a little scratch.