Task: Question Answering
Input (English): passage: Like its predecessor, Left 4 Dead 2 is set in the aftermath of a worldwide pandemic of an infectious disease known as the ``Green Flu'', which rapidly transforms humans into zombie-like creatures and mutated forms that demonstrate extreme aggression towards non-infected (much like the infected in 28 Days Later). Few humans are immune to the disease, still carrying the infection but showing no symptoms. The Civil Emergency and Defense Agency (CEDA) and the U.S. Military create safe zones to attempt to evacuate as many American survivors as possible. Left 4 Dead 2 introduces four new Survivors--Coach, Ellis, Nick, and Rochelle, who are immune to the disease and have individual back stories that are provided through character dialogue. While the game is intended as a continuation of the original, occurring one week after the first game begins, Valve decided to create a new group of Survivors due to the change in location. Like the first game, the five campaigns in Left 4 Dead 2 are set across a story arc, set in the Southern United States, which starts in Savannah, Georgia, and ends in New Orleans, Louisiana. The four Survivors have to fight their way through hordes of Infected, using safehouses along the way to rest and recuperate in order to reach extraction points.
 question: does left 4 dead 2 have a story?
Output (English): Yes