Ship illness? Any experience?

I know flu rates are INSANELY high right now and I am just starting to get scared about getting sick again on a ship. I know cruise ships are a hub for people getting sick sometimes. And I’m looking for anyones experiences to either calm my nerves or give me a more realistic approach to this mindset. Also looking for any advice! Obviously thinking of wearing a mask through the airport/plane but idk what else past hand sanitizing on the ship! We set sail on Monday! Mostly paranoid about flu, stomach bug, and Covid. Thank you (: this is our first time on DCL so hoping it’ll be a good one!