28 Weeks Later is a 2007 British post-apocalyptic science fiction / horror film, and sequel to the 2002 film 28 Days Later. The film was directed by Juan Carlos Fresnadillo, and was released in the United Kingdom and North America on 11 May 2007.

The film opens with Donald and his wife Alice in an English cottage sheltering from the Rage virus that has ravaged Great Britain. Together, with a variety of survivors as they sit down to a quiet meal, a young boy can be heard shouting and banging the door from the other side in desperation. Against everyone's wishes, Don opens the door and lets the frightened child in, who reveals how he managed to escape the Infected. But this peace is short lived when one of the survivors is attacked by the Infected, thus turning her and leading to an attack on another survivor before Don kills her. Suddenly, the Infected barge in and the survivors flee the cottage. Everybody is presumed killed or infected except for Don, who flees and leaves his wife and the young boy to die in a moment of panic. Escaping from the infected, he hijacks a small boat and speeds away. Titles appear, outlining the timeline from the outbreak of infection through the quarantine of Britain, the last of the infected dying of starvation, the arrival of American-led NATO troops, the planning of repopulating and finally 28 weeks later...

Source : http://en.wikipedia.org/