well,
for one don't drink out of a water hose. I used to do that in my younger days but grew out of that, you know when you thirsty playing out and about you just gotta have the water.
and the BEST anti RatLungWorm defense today is to wash your Veggies very well! Just like catching some BAD #2 viruses when people don't wash their hands well and touching things in which others also touch as well.
The health problems will never go away, it will always be somewhere
"Washing" is the KEY word

And you know what, he musta ate some of the veggies he harvested, Yikes! somehow that slug got into his mouth, yeah?