Awakening

Day1- first case of the infection is discovered in the Second world countries.
Day5- medical teams from America are dispatched to help contain virus and collect a sample.
Day12-all those infected were exterminated with a blood sample collected for studies.
Day18- sample reaches federal science building in Washington DC.
Day19- virus is contracted by medical teams.
Day24- America has been destroyed by the virus.
Day30-Military set up 5 encampments, in a hope to save all those not infected by virus.
Day 35- Echo Base falls to the virus.
Day43-Delta Base falls to the virus.
Day50-Charlie Base falls to the virus.
Day59- Bravo Base falls to the virus.
Day75-Alpha Base falls to the virus.
Day80-all military forces diverted to keeping virus contained in the country and to prevent global spread.
Day100-containment fails. Virus goes airborne and the whole world is infected.
Day120-all government leaders meet up on the only place not infected, a small island in the Pacific, to discuss taking the world back from the infected.
Day125-virus reaches the borders of the island, all military personnel are tasked with killing ALL infected on the planet.
Day150- the America branch is separated, most turned, the remainder fled.
Day151- Private Dom Richards finds himself trapped in a house, surrounded by infected, with mere minutes before they break in.

And this is how it begins...