Has anyone on this board ever got Roundworms from their cat? Also, how long does it take for Deworming Meds to kill the Roundworms in cats? I am a first time cat (animal) owner. I took my cat to the vet yesterday. The Vet said that my cat had a small case of Roundworms and gave her Deworming Med. We started that yesterday. Today I could see the Roundworms in my cat's stool. It was my first time to a vet, and, a great deal of information! I want my cat to get well and hope that her deworming med kills the worms soon. I am concerned about my four year old son and my elderly parents getting Roundworms. It the passing of the worms from cats to humans common? I have known several cat owners and have never heard of them of catching Roundworms. Thanks for helping me!