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From what I recall of 28 Days Later, where the old guy gets infected and turned with a bit of infected blood, they (or at least he) didn't have immunity to the plague, unlike in Left 4 Dead. Is this the case in The Walking Dead as well? They don't seem to be particularly careful about how they splatter the undeads' bodily fluids all over themselves (be it a rock to the head or machete to the gut).

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They probably aren't 100% sure how the infection works. –  Origami Robot Oct 23 '11 at 4:24
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6 Answers 6

In the comics it is established that everyone already is infected, though the symptoms only show after you "die" unless the brain is damaged too much.

This was shown with

Shane. He died by gunshot, yet turned into a zombie while laying six feet under without having endured any zombie-bites. After Rick learned of that fact, he dug him up again and killed him for good.

This also applies to the TV-show:

There was a man, who committed suicide by hanging himself in a tree, and he turned into a zombie as well. Andrea had him killed out of mercy.

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I think the person in your second reference got bit and then did what they did. –  Royal Flush Nov 16 '11 at 20:44
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NullUserExceptionఠ_ఠ is correct, they found a note saying something like "I got infected, fever started, opting out." –  OliverS Nov 17 '11 at 8:26
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@OliverS The exact note read: "Got bit. Fever hit. World gone to shit. Might as well quit" –  Royal Flush Dec 14 '11 at 5:50
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The survivors have no immunity.

In both the graphic novels and the show the survivors have at least one member of their group get bitten, and start to show symptoms of the infection.

It is also mentioned that they had to take care not to get any part of the walkers, particularly the fluids, near their mouths or eyes.

this comes up particularly when they are covering themselves in walker fluids to mask their scent.

Presumably this is to reduce chance of becoming infected by contact.

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They talk about taking care not to get spattered in the eyes or mouth, but they almost never bother with eye protection before swinging the axe, not even in the scene you mention. And for all we know it may require blood contact anyway. –  Beta Feb 17 '12 at 20:29
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This answer is based on information up through the end of season 2 of the TV series. In the episode Better Angels, we see two people die. Neither die from walkers, instead they die from human on human violence. Their dead bodies are not touched by walkers. They both return as walkers. Afterwards, Rick confirms to the group that Jenner told him that they're all infected.

In season 1's Vatos, one of the survivors, Jim, is bitten during a walker attack. In the next episode, we see that he's getting very sick incredibly quickly. We're led to believe he'll soon become a walker, an experience some of the survivors have had prior to Rick's waking up.

I think what we're seeing is that the disease that causes the walkers is dormant in living humans. Only once a human dies does the disease become active. Once active, it animates the brain stem and turns the body into a walker (as shown in TS-19). Now that the disease is active in that body, biting a living person introduces the active form of the disease to the living person's system. This disease is deadly or at least turns them into a walker quickly.

It'll be interesting to see what happens with

Lori's

growing fetus in season 3.

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Almost every interaction with the walkers ends with an inspection for cuts or bite marks. This suggests that the current survivors don't believe that they have any particular immunity to becoming zombies themselves. It also indicates that casual contact with the walker's fluids is not sufficient for transmission.

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It is said in the series that all people are already infected with the disease... This was revealed by Dr Jenner to Rick back in the first season.

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We know everyone is infected already, but it is possible that someone is immune. With the world ending there aren't many doctors to consult on the subject.

In the TV show version, it is possible Jenner told Rick more than everyone is infected. He could have also said "but your son is immune." Rick wouldn't want to announce that. People like the Governor would cut Carl up to try and find a cure.

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