One year we had a bad flea infestation and had to call pest control out 2 or 3 times to spray, spray, spray and we Frontlined the herd as well for several months in a row. That was AWFUL!! But ... no worms. We’ve just been lucky I guess. Or missed the signs?
i was shocked when one of my cats came up positive for worms.No signs, and I’m obsessive about cleaning the litterbox. But there they were on the slides. That’s when the vet told me since he was a kitten rescue he more than likely got it from his mama’s milk, which is the way roundworms are transmitted to kittens. I had to worm the whole herd, and since then I’m paranoid.