i would love a 1%-10% chance to survive a bite, 1-10% depending on your character stats and lifestyle... even 1-5% to give the player the motivation to try to overcom the infection.
you'll spend a few days fighting the infection (fever, cough, panic...) and then ... turn into a zombie for the vast majority of case or not if you're lucky (very lucky, and spend 3 days : eating fresh food/ drinking water / sleeping...) playing the agony sounds fun (to me) the 100% chance isn't realistic anyway.