Dead, or captured :P Either side would not seem all that appealing to him. But hey, if you want to go with that, we can! And he -is- good at running away, so that would make it all the funnier XD
But, as stated, nobody would know hw couldn't be infected until someone actually tried to infect him and it fails. I can imagine the rumors about it would spread through the infected and the army, and they'd start trying to get a hold of him.