(SPOILER)People on the internet are arguing that the plague causes everybody to turn after they die - they used arguments like how Rick would shoot everybody in the head (like the two guys in the bar) and tied it to what Dr. Jenner whispered to Rick at the end of Season 1.

Then there was the argument that Shane infected himself either in the bus, or by getting stabbed by an infected knife (what? didn't Rick use his own knife?) and Randall was infected by the same knife.

I don't buy it because Randall was never cut by that knife (he had his neck broken) (or bit). So I'm waiting for the airborne virus / everybody turns into a zombie after they die Romero nonsense