Is it ever a bad idea to do a parasite cleanse? Is there such a thing as a good parasite?

I've been reading around the forum and found some posts concerning parasites NOT being a bad thing.

//www.curezone.org/forums/fm.asp?i=1606185#i

I am wondering, if my main problem turns out to be something besides an overabundance of parasites, could I possibly be killing a *good* parasite? This is the first time I'm doing Para Cleanse, to prepare for a Liver Flush. I suppose the next question should be, 'Is there such a thing as a *good* gallstone'.

I had been thinking that being ' parasite free' is the ultimate, if impossible, goal.

Sorry if this is crazy talk. It's very late and I need to call it a night. I appreciate any thoughts about this.