As far as my heaslth goes, so far so good.  As they say in that old Monty Python sketch about the plague, "I'm not dead yet" https://www.youtube.com/watch?v=Sh8mNjeuyV4 Plus, you would have to come for ALL the cats, because house cats create them too, as do the somewhat larger felines at the zoos that are oh so close to the water.  I'd rather concentrate on getting the FDA to do its job so we all don't get food poisoning from the less favored birds, and the unspecial fish, as well as the totally unimportant cows and pigs.  Ever see local pork products teaming with maggots?  I have.  If you want to save the sea monks, NOAA says that a major cause of their deaths is starvation, so maybe you'd concentrate on preventing ocean acidification and over fishing. But you go door to door and try and round up the kitties to save us all from toxo, but I think it's a colossal waste of time.