[He had an idea of what she was thinking, because he'd thought it himself, but it wouldn't work. When powerless there were odd effects when it came to their vessels, and in Castiel's case at least he'd been somewhat merged with it; if the body had died from the infection, the angel part would have as well. If that were the case for Lucifer, Lucifer the angel would have simply been eventually resurrected by the Animus, possibly even with his vessel. That'd serve no purpose.]

It's unlikely. I warned him of the situation; as entertaining and satisfying as it might be to let him suffer through the illness and become a zombie, it would lead to be a poor result in the end. [Like a zombie angel, and then an angry resurrected Lucifer.]