I hve read about this species, the one infecting at least one of my cats, on 20 or so web sites. Most just repeat the same information. I am trying to pinpoint where they came from since he should have been worm free when we brought him indoors. Both my wife and I suspect that they were picked up at one of the two veterenary clinics that our two cats have spent overnights in since Marlow came indoors for good. Marlows overnight was on November 20. Sasha's overnight was not til December 22. I understand the life cycle but I 'm trying to nail down a time frame.