Galan007
|Quantum Observer|
I think john is referring to these happenings from a comic book standpoint. In the comics, a zombie's bite doesn't actually spread the virus. You see, every human is technically infected, but that gene is dormant--it is only activated by 'general' death. That being said, bites from zombies don't actually spread the scourge, they just cause massive blood loss, and/or infections, that can ultimately lead to death, subsequently causing that person's 'zombie-gene' to activate.
Truth is, any human who dies (no matter what the cause) will transform into a zombie, unless significant brain damage is associated with their death.
Robert Kirkman:"...the rule is: WHATEVER it is that causes the zombies, is something everyone already has. If you stub your toe, get an infection and die ... you turn into a zombie. UNLESS your brain is damaged. If someone shoots you in the head and you die ...you're dead. A zombie bite kills you because of infection, or blood loss ... not because of the zombie "virus.""
So if the television series opts to follow that plot-point, then I think it's very plausible that Jenner told Rick something along the lines of: "everyone is infected. No matter how they die, they'll turn into zombies."
...Or the plot diverges from the comics completely, and we find out that only Rick is infected, but he's inextricably immune to the virus. Hence Shane being so adamant about hearing no heartbeat before leaving the hospital, yet somehow Rick mysteriously reanimates.