On October 31st, 1999, a group of eco-terrorists released a biological weapon at every major airport in the world. The first level of infection was direct inhalation within 100 yards. The infected become sick with flu-like symptoms. 48 hours later, the true nature of the weapon became clear. The infected became violent, infecting others through bites and scratches. 50 hours after the first contagion was released, governments across the globe initiated states of emergency. Sites were designated as shelters with troops and Aurors sent to protect those sites at all costs.
Radio broadcasts gave the locations of the Ministry of Magic and Buckingham Palace as 'safe spots' but they were really processing centers screening out the infected and sending the uninfected via the Floo network to hidden shelters. Those lucky enough to find shelter must now wait it out – the 28 long days for the infected to starve to death or kill each other in their madness. Then they will have the unenviable task of rebuilding society and the world.
Plus 28 Days is a Post DH HP-based Panfandom RPG that began on October 31st, 2009.