How many years after the events in The Kill Order do the events in the Epilogue occur? What happens in the Epilogue?

Two years later, in a small apartment, dark and dank, a woman is expecting a knock on the door, which comes. Her son, her only child, is taken for experiments to find the cure. The woman cries as the others leave with her son, for she will never see him again. One of them suggests the name Thomas, seeing the swinging light bulb from the ceiling.