Quarantine is a 2008 found footage horror film directed and co-written by John Erick Dowdle, produced by Sergio Aguero, Doug Davison, and Roy Lee, and co-written by Drew Dowdle, being a remake of the 2007 Spanish film Rec. The film stars Jennifer Carpenter, Jay Hernandez, Columbus Short, Greg Germann, Steve Harris, Dania Ramirez, Rade Šerbedžija, and Johnathon Schaech. It follows a reporter and her cameraman assigned to a pair of Los Angeles firemen who follow a distress call to an apartment building where they discover a deadly mutated strain of rabies spreading among the building's occupants; escape becomes impossible once the government descends upon the building to prevent the virus from spreading beyond it, and the pair continue to record the events that unfold inside, of which the film itself is the result. Quarantine features no actual musical score, using only sound effects, and differs in its characters, dialogue, and explanation of the virus from its source material.

Found footage is a cinematic technique in which all or a substantial part of the work is presented as if it were film or video recordings recorded by characters in the story, and later "found" and presented to the audience. The events on screen are typically seen through the camera of one or more of the characters involved, often accompanied by their real-time, off-camera commentary. For added realism, the cinematography may be done by the actors themselves as they perform, and shaky camera work and naturalistic acting are routinely employed. The footage may be presented as if it were "raw" and complete or as if it had been edited into a narrative by those who "found" it.