And that's a good outcome.
People and kids can die before they really even know they're sick. I interviewed a young woman, a young mother, years ago...She was young, and vibrant...and she caught some flu bug that attacked her liver. She felt a little bit sick...and the next thing she knew she was on the floor and couldn't move. Someone found her, took her into the hospital..her liver was jello. When I interviewed her, she was around 22 years old and had received a liver transplant...but her chance of a long and healthy life was pretty much zero.
Likewise, people poo-pooh measles.."Oh it's just a little rash that goes away, the vaccine is more of a threat..." bullshit it is! Measles is potentially lethal, and when you have an epidemic, lots and lots and lots of people die from it.