What seth means is that every frog have some parasites and worms,
some of them are actually quit good for them,
just as we have good and bad bacterias.
***Very interesting, I didn't realize that frogs normally have parasites that are helpful.

WC frogs ALWAYS are infested with them while CB will have far less.
By putting a WC with a CB you give the oppurtunity to pass on some of the stuff from nature into your "clean"environment.
***This makes a lot on sense, since CB's aren't subjected to the same enviroments the WC are and therefore don't have the natural resistance.

Another big problem can be between 2 WC species from a different place.
A frog from America may be resistant to types of diseases since evolutionary they geneticaly build up resistance.
Adding for example an Asian frog to it,
you bring in stuff they are not resistant to since it is unknown for their biology,
same goes with the Asian frog that will be prone to catch a typical American disease.
****Kind of like the native americans and small pox and Mexican's, and other countries like India, were drinking the for us is.....a pooping experience!LOL Good ole Montezuma's revenge!LOL