[tbw2]

I assumed Sean was infected by the knife he used to cut his hand with for blood to draw zombies to the bus door after using it to stab the zombie cops in the head at the fence.

[21twelve]

You may still be right that Shane was infected by his knife, and the prisoner infected from rubbing his wrists raw in the barn that had previously been “lived” in by walkers. (Trust some gov’t guy at the CDC that says EVERYONE is infected?!)

Of course, everyone could be infected, but do not ever show symptoms - just like many normal diseases.

I’m wondering where I can buy those 20-shot shotguns that still look like normal ones.

And I’m wondering if Herschel ever gets around to remembering that there is a prison a tank-of-gas down the road from his farm?

And any takers that Rick is showing early signs of Zombieism?

[unkus]

I think you are right. Gross stuff.

[x]

One thing I didn't get about these shows: sometimes there is so much blood flowing, spurting, and gushing that you'd assume people got infected that way, but it usually takes an actual bite.

In TWD, these people were all infected long before -- back in Season 1. The CDC researcher whispered that to the sheriff, and it's only revealed in this episode. Just how they were infected, we don't know yet.