This discussion may contain spoilers!
Okay here is a serious thought. Maybe sense Clementine got bit by Sam the dog there's a chance that Clem will never become infected. Now this might sound crazy but please hear me out. Nobody even came up with the thought that Sam could have survived off eating those dead zombies in the camp. No wonder why the scene seemed unrealistic. When you get become a walker you become more intelligent and full of rage.
Now when Sam bit Clem he already kind of gave her Rabies. Clem fainting in the woods before Luke and Pete came was an example of that. Rabies is basically the infection that caused zombies and people to go wild. Clem has zombie blood in her DNA already. She is immune but can still die. I know people are going to say,'' This is the most stupid theory ever'' Clem is not Ellie from The Last Of Us Lol.
Sam the dog was eating those walkers which made him crazy and smart. When he bit Clem the DNA went inside Clem's DNA which caused her to faint.
So basically I'm saying Clem won't get infected or die because the bit from Sam the dog. Clem can still get bit and killed tho...