This movie has seemed to of influenced many things
The most obvious influence this movie has had on something else is the tv series the Walking Dead. The pilot episode has Rick waking up in a totally abandoned hospital after waking up from a short coma with many many questions to ask about a world he struggles to now recognise, and no one immediately to answer them. Just like how Jim in this movie did exactly the same.
Another influence of course is the playstation 3 game The Last of Us. This game has highly aggressive fast running zombies in, which i think no other movie out there had before 28 Days Later. Also in The Last of Us, the protagonist has to protect a young girl who seems to have a natural immunity to being infected by zombie bites, just like the 2 children seemed to of had in 28 Weeks Later.
World War Z kind of uses the aggressive zombie idea, but adds more complexity to the infected (i cant say tho otherwise im giving spoilers away to World War Z)
What other movies, tv series or video games do you think this movie has had obvious influence on?