i cant tell if they are saying that the corpse was infected and was conitnuing to give off virus while dead?
Sounds like it. After all, to spread disease during a siege in the Medieval ages they used to hurl the bodies of plaque victims via catapult over the walls of castles. Simple contact would spread it, although I will leave the details of contact to the imagination.
Nasty, but an effective, if primitive means of bio-warfare.