Monsters (2010)

Genre: Sci-Fi / Drama
Starring: Whitney Able, Scoot McNairy
Country: British

Six years after Earth has suffered an alien invasion a cynical journalist agrees to escort a shaken American tourist through an infected zone in Mexico to the safety of the US border.

http://www.imdb.com/title/tt1470827/
http://en.wikipedia.org/wiki/Monsters_(2010_film)