I could probably find any number of things that have a similar age distribution. Diabetes, perhaps.
You are probably shaped like a pear. Are you a pear?
Lions are shaped like house cats. Would you keep a lion in your house? From what I’ve heard that usually ends badly.
Even if it were “the flu” it would overwhelm our HCS in short order if allowed to roam free.
But if you are so convinced it’s “the flu” perhaps you should go volunteer at one of the hospitals. They are begging for help.
So, they're cats.