We have a breakthrough! Our zombie specimens have given new insight into the nature of the Scourge's plague. They have born rotten, delicious fruit...
Take this box to Orgrimmar. Inside is a head that is infected with the zombie plague, and something else... an anti-plague. The two plagues battle within the zombie brain, and that brain is the key to a cure, I am certain of it.
Salutations, <name>. You come from Shattrath? You have instructions from Grand Apothecary Putress?
Ah, very good. The diseases this rotted head carries are deadly, but we must not shy from danger or from what we find distasteful. Some day, <name>, you will learn that damnation is the path to salvation...