Red Zone (2013)

Jake, Sigourney and their new baby, Connor, have survived a devastating invasion from a greater power. They live out their days, undisturbed, in a rain forest, sheltering inside a deserted double decker bus. Connor has been plagued with a horrible infection that is only getting worse. Jake and Sigourney must leave the safe haven of their bunker and venture into the military occupied Red Zone for antibiotics to save their child's life.