Don decides to risk going to a nearby farmhouse to scavenge. Before leaving, he kisses Alice goodbye. While he is gone, a young infected boy stumbles into the cottage. Jacob tries to calm the boy, but the child turns violently, vomiting blood into Sally's eyes, infecting her instantly. Chaos erupts.
The film opens with a direct continuation of the original virus timeline. It has been 28 days since the initial Rage Virus outbreak in the UK. 28 Weeks Later Movies
Scarlet realizes the children are their only hope (Alice’s offspring may also carry immunity). She, Tammy, and Andy flee into the subway tunnels just as the bombing begins. Meanwhile, a sniper named Doyle (Jeremy Renner) , disgusted by the "kill everyone" order, abandons his post to help them. Don decides to risk going to a nearby farmhouse to scavenge
"...God help us all."