Imagine for a moment that the rage virus, or zombie state was transmissible thru bite contact, then not only would a person become zombified by Sue Storm, they'd also be semi-invisible, or if really good and dead, completely transparent. Forget being friendly, even Caspar would bolt, these vanishing zombies would be invincible. The only time they'd be vulnerable to sight are those few seconds just before dawn. Something to do with the light during the exchange, displaces their molecules and restores their image. But usually when somebody gets to see them, they end up joining their legion...
Thanks for checking this out!