system
Given the following post, respond as if you're commenting on Reddit:
human
[Walking Dead] Why hasn't anybody been infected by blood splatter?

They seem pretty casual about the blood that goes flying when they brain a walker. Seems just as dangerous as a bite for some blood to get in the mouth or eye.

(I'm not caught up on the show, so don't spoil it if this happens in the more recent episodes)
gpt
How far along are you? 

If you've seen the end of season 1 then you should know that everyone is already infected. If you die from natural causes you still turn into a zombie. 

The bites only serve to kill people faster by making them lose a lot of blood or through other complications since they don't have any hospitals.