@darkcisum There is nothing viral about the #GNU GPL, it doesn't "infect" your code.
> If you integrate a plugin into WordPress, which is under GPL, is the plugin also required to be GPL, because of this virality?
The simple answer is "no". This is ignoring and simplifying things to the extreme, to answer one needs a more elaborate scenario. E.g. are you distributing the combined work? No? Then you've not accepted the terms of the GNU GPL and can really do anything you want.