I have read were others have not gotten sick, with a virus, so yes, I think there is something to it. I do believe that it is our immune systems have become over run and can't fight it so we don't really get symptoms or it could be that the parasite itself does not thrive in a virus infected host and eradicates the virus itself.
I don't know but one thing I do know is that there needs to be way more research on parasites. I know I am preaching to the choir but I believe like a lot of you do, that parasites will become an epidemic world wide, not just in third world countries. My wife and I are fairly well off, very clean and healthy people. So if we can get infected, then anyone can too.