Originally Posted by GetSomeE92
I thought the same thing. Maybe the virus does not survive outside of a host.
However, in the very beginning of the show, the first people that Rick ran into when he made his way back to his house said something about people who were infected being overcome by fever, dying, then coming back. (That being what happened to the guy's wife.) If everyone was infected, wouldn't they have succombed to the fever by now?
I think that the scientist told Rick something about his wife being pregnant
bingo...these are my thoughts exactly. i believe the scientist told Rick his wife was pregnant. and i thought it was common zombie scenario that once you're infected...it makes you ill (fever, etc.) and causes you to pass away usually within a few days...and then you return as the walking dead.