Thanks, Bella, for your input. Okay, it looks like we ALL have to be checked out in this household. If one cat has parasites, the others do, too. And who knows what I've caught from them. However....the last time I took Herbie (the cat hoarder rescued cat) to the vet, the vet took a stool sample on site (via rectal thermometer) and there were no roundworm eggs or other evidence of parasites. Herbie had been dewormed around two weeks before this visit. One of the problems of multiple cat households is that you simply cannot distinguish between stools for a stool sample. In any event, does anyone know about how feline roundworm infestation manifests itself in humans?