I found 28 Days Later a definite "horror" movie. With zombie-like creatures and death from a virus all around, this movie definitely meets the criteria of a horror movie. There were horrible monsters in the movie, there were horrible elements of implicit blodd and gore, there were the typical scenes from other horror movies, the killing of a father, anyone could be infected scenario. People have probably seen horror elements that were incorporated into this film somewhere before.

What 28 Days Later accomplishes is making the horror genre into a more sophisticated film production using good cinematic elements of light and dark, camera techniques of blurring - grainy shots, of using a tight script that contained subdued, haunting implicit emotional psychological cues. Just because this movie isn't dumb and all blood doesn't throw it out of the horror genre. Just because we have a possible scientific (fictional) premise for zombie-land doesn't eliminate this movie from the monster category. Just because the psychological thriller of "Psycho" is introduced doesn't force us to jettison the label horror for this movie.