I'm pretty sure everyone is already infected, because of his drug dealer friend that turned after he killed him without being bitten.
+1, everyone is infected, that was revealed on TWD season 2... you die and you turn, doesnt matter the cause of death! Military will be a little overwhelmed with the whole issue (especially at nite, we saw power going off already in the whole city), my guess is that they try (unsuccessfully) to kill a big % of the infected by dropping bombs and/or napalm and that ends up making it worse in a way cause every human injured and killed by accident will turn and so on. Is the US army really able to contain something like this in the WHOLE territory (lets not forget the outbreak is worldwide and the US has more than 50% of their army offshore... in a crisis like this, I cant imagine all the troops coming back in a timely and organized fashion to secure the homeland).