Try 27 Days Later (think it's called that)...
It's 28 Days Later, Quik. You know better than this. smh.
There's 28 Weeks Later, Dawn of the Dead, Land of the Dead, Zombieland, and Pontypool.
(Pontypool is an underrated zombie movie that a virus has infected words in human language, saying certain infected words will cause them to repeat the word over and over. Once they said and understood the word, they turn into zombies.)