After the virus mutated it created monsters. The virus lost some qualities as it mutated, like being airborne and transferred through touch. But if get bit by one of the freaks, pray for your sole. Sean, Mark, and Jace were the only ones in their neighbourhood that seemed to survive. The once praised teacher and famous YouTuber now had to keep their family alive. They had to learn a new way to live, without doctors to help Jace's condition.