28 weeks later: after 5 weeks, all the infected have died of starvation. After 11 weeks, US and NATO forces invaded Britain, and after 18 weeks the nation is declared to be relatively safe, although still under quarantine.
28 weeks after the outbreak, two kids, Tammy and Andy, mournful over the loss of their mother, slip out of the safe zone and make their way through the empty and ruined London to their former house, hoping to retrieve and take their old belongings with them. To their shock, they find their mother Alice in a semi-conscious state. Alice is taken to a biohazard room where she is tested and found to be infected with the Rage Virus, but only as a carrier. When her hussband Don kisses her he is infected and a new outbreak of the virus starts...
The kids eventually escape and are flew to France.
A group of infected run through a tunnel which, as they emerge into the open, is revealed to be the exit of the Paris Métro Trocadéro station with a view of the nearby Eiffel Tower. The US and NATO forces fail in stopping the infected from spreading trough Paris and for months the rage virus spreads trough out mainland Europe.
Tammy and Andy have found shelter in the last strongholds of the NATO: their reinforced headquarters in Germany. When a German medical team wants to do tests on Andy they both escape the compound and are hunted by the NATO, as well as the infected.
As Europe is abandoned by the USA and the rest of the world, a Special Forces team of the US Centers for Disease Control and Prevention, CDC, tracks down Tammy and Andy, and offer thema free passage to America.
The movie ends 28 months later when we see that when testing Andy, a CDC bio engineer is being infected with the Rage Virus.
