It’s not clear that a ‘strong’ immune system will help. There’s some evidence that some of the worst effects of the virus — aren’t the virus, but, instead, that person’s immune system over-reacting, much like the 1918 influenza (sometimes called the ‘Spanish Flu’, even though Spain was neither the origin nor the epicenter).
That said, feel free to lick some door knobs to see how ‘fit’ you are — and then stay the hell away from the rest of us!