I thought Rick was only in the hospital for 1 month. And the zombie outbreak happened towards the end of that time. More time passed as he left the hospital, found Morgan, and made his way towards Atlanta.
That could be true, but somehow I remember "three month coma" for some reason. Anyhow, even ONE month with no one to change the dressing, IV bags, antibiotics, etc., would not have a guy coming to and able to walk out on his own, riding a bike, etc. I know Morgan looked after him for some time until he was fully healed and started out looking for Lori and Carl. It's weird that such a disease could spread world-wide so quickly that nowhere is free from it. Maybe some Caribbean islands??? When the CDC doc tells Rick "everyone has the virus" and don't need to get bitten to reanimate, there is never any explanation for how or why it started in the first place.
There's going to be a season five, I read, so do you think the cause may eventually be revealed? Maybe some government bio-warfare plan gone amok???