That everyone is infected shyt wasn't in the comics. You had people making guesses about what was turning people into zombies but it was never stated as a fact simply because of situations like the shyt with Dale's leg.
Also if it was just about infections then lots of people would have turned already from various cuts. In that world nothing is clean. You got dead corpses lying everywhere, people burning corpses, little to no soap, disinfectant.
Kirkman even said himself that he kept shyt vague in the comics because you run into trouble once you start trying to explain things too much.
the "everybody is infected" plot is in the comics as well. just wasn't the cdc guy who told them that. in the books, tyrese daughter gets killed by her boyfriend, then turns into a zombie. that's when he decides to drive to shanes grave to confirm it. that's when he realizes everyone is infected, and he tells the group as such.
and im just explaining how it goes down. im not going into how sterile the environment is. just that the bite is what's lethal and kills you.
and im just explaining how it goes down. im not going into how sterile the environment is. just that the bite is what's lethal and kills you.