Well, unless you stay inside and never go outside and you have your home covered in plastic sheeting you're going to pick up germs.
Kids in school? They're going to be sick. Kids in child care? They're going to be sick. Hubby works? You work? You both bring home germs every day on your clothes, in your hair, on your shoes, purse, etc...
Cleaning your house doesn't really do anything. You can stop that sort of cleaning. Washing hands, wiping the carts at the store with the wipes they have by the door, those are things you can do to limit how many germs you come in contact with.
Since I've been wiping down the shopping cart handles when I go in Walmart I haven't been sick. Not in almost a year. Not really really sick. I've had allergies that gave me cold like symptoms but I haven't had a serious stomach virus or upper respiratory infection in over a year.
I even take a few wipes and wipe down the cart when I'm done. Then I use those wipes on my car door handles, the gear shift handle, the radio knob, and the inside handles for the door.
I don't know much about Florida seasons other than hurricane season and not hurricane season. So I suppose there isn't much chance of this going away since it's spring and everyone gets more fresh air.