That's still a possible theory, but with Shane dead now there is no way they can come to that realization since he was alone on the bus. Besides, it doesn't explain Randall's infection.
It's becoming pretty clear that everyone is a potential walker with death being the cause.
@DDustiNN, the guy in season 1 got sick because he was only injured(scratched? I don't recall), he hadn't died yet. The wound was obviously infected though, so he would have died and turned eventually. As for the two guys in the bar, I believe Rick finished them with shots to the head, so they didn't have a chance to turn.
Recent discussions in the Video Games forum
|Roguelikes||1||2 minutes ago|
|New PS4 Exclusive Gorgeous-Looking Adventure Game Submerged Revealed||2||3 minutes ago|
|Atlus Making Four Cuts In Upcoming Game To Avoid An Adults-Only Rating||35||3 minutes ago|
|OT: Jared Leto's Joker officially revealed||9||5 minutes ago|
|Picking up a PS4 tonight.||42||10 minutes ago|
|Sony raises FY 2015 profit forecast to $2.5 billion Profit. Highest Since 2008.||0||11 minutes ago|
|I'm Back ............For Weekend Gaming 4/24-26||74||12 minutes ago|
|NeverWinter sale on Xbox One||5||13 minutes ago|
|OT: 2015 NBA playoffs!||165||14 minutes ago|
|ot Are you a racist?||11||15 minutes ago|
|OT: What Are You Listening To-2015 Version!||471||18 minutes ago|
|PSN Down Again?||14||48 minutes ago|