I've only read news about this from bad sources and this one did not clarify my misconceptions either. Someone who has read better news than I, please set me straight on this simple thing.

Are the "zombie" bees in question: 1) Undead creatures or 2) Normal bees that been infected by a parasite and acting against their nature?

In other words, is there a parasite that causes dead bees to come to life? Or is the "zombie" metaphor used to indicate that they don't really have a will and mind of their own?

I feel really stupid asking this, but all the news I've read have been incredibly badly written. You can only imagine how bad the Finnish translations of this news have been, given the quality of the original English articles.