"zombie bites spread infection" implies zombieness (zombidity?) is a saliva-transmitted disease. since zombies tend to be in pretty rough shape (some of them don't even have jaws!) it makes sense they'd want to conserve biting energy.
the logical conclusion is a zombie who infects its victims by licking their eyeballs
I mean, infection through blood dripping into someone's eye is a real plot point in 28 Days Later so yeah.





















