28 Weeks Later is a 2007 British-Spanish post-apocalyptic science fiction horror film, structured as a sequel to the critical and commercial success, 28 Days Later (2002). 28 Weeks Later was co-written and directed by Juan Carlos Fresnadillo, with Danny Boyle and Alex Garland, director and writer of 28 Days Later respectively, now acting as executive producers. It was released in the United Kingdom and United States on 11 May 2007. The on-location filming took place in London and 3 Mills Studios, although scenes intended to be shot at Wembley Stadium, then undergoing final stages of construction, were filmed instead in Wales, with Cardiff's Millennium Stadium used as a replacement. Wikipedia
Scarlet: It all makes sense. They're executing code red. Step 1: Kill the infected. Step 2: Containment. If containment fails, then Step 3: Extermination.