Will we ever find out what the cause of the infection is? Im very curious about it. Has Robert Kirkman ever stated if it is caused by supernatural means, or biological means?
And another thing: Since everyone is already infected, why do you get infected again when a walker bites you? It makes no sence, since you already have the "zombie" virus. I've read somewhere on the wiki that what causes you to die is the infection from the open wound, but then why does every damn one who gets bit die?... If the only danger was the infection from the open wound istelf, then you could just take an anitbiotic cure, and as seen many times the group got that.