Day 3: 4:00 a.m. – 5:00 a.m.
CTU shuts down the ventilation syatem to minimize the effect. Alvers and Dessler make a deal for her to kill him if he starts showing symptoms; and in exchange, he reveals that he has added a chemical compound to the virus for accelerating its effect. Ortega starts having a nosebleed and showing other symptoms. One of the staff tries to break out of quarantine; but Dessler convinces him to stay. One of the guests also tries to break it before he is fatally shot by Dessler. Meanwhile, Jack leaves the room Amador is held, giving the latter the chance to escape. This is revealed to be CTU’s plan in order to follow Amador, who meets Saunders’ operative in a car, which explodes and kills them. Jack gets a call from Saunders, who has delivered the vials to his operatives, and connects him to David. Saunders threatens to release the virus in more populated regions if his demands aren’t fulfilled. In the meantime, David lies to the police by confirming Sherry’s alibi before expressing her his displeasure and demanding her to leave.