Some sort of virus was released in a prison which made the prisoners frantic and crazy (maybe turned them into zombies?). A group of non-prisoners had to escape from the jail.
I remember two scenes.
In the first scene a prisoner who had his legs cut off is chasing someone by swinging on the ceiling like you would swing on monkey bars.
The second scene takes place towards the end of movie or is the end. A few lucky survivors have made it out of the prison. Police and medics have arrived. Someone infected by the virus is tied to a gurney and is manically laughing.