Fallen world in a war for dead

Clarity is on her way to visit her friend who used to work with her but got a virus while in her job. What happens when the room is empty and nobody is left in the building?
quote:
"Mary Nicole Ambers, patient number 824 is in room hold 89."
I look around the room again and am confused to see nobody in the room. "Recheck for patient number 824 by the name of Mary Nicole Ambers please."
"Mary Nicole Ambers, patient number 824 is in room hold 89."
quote:
"All patients have broken through hallways DS and MK exits, lockdown in 30 seconds. Standby." My phone went dead and the lights shut off but the emergency lights came on.