Is Rick Immune to the Virus? My Take on the Healing Factor in The Walking Dead Is Rick immune to the virus? Given the somewhat miraculous healing factor and ability to adapt to these insane circumstances that the show portrays, I would say that yes, Rick Grimes is probably somewhat immune to the virus. It is said that everyone however is infected, but I just can't ever see the show portraying a Walker Rick Grimes limping over to attack someone, the [...]