Three years ago the virus started.
Some people said that it was a bio-weapon, others thought it was released from the ice-caps melting. They were wrong, but who cared when in six months people started dying and nine billion people turned to four.
Humanity trudged on and the virus died out. Governments were restored and order maintained.
People tried to forget the outbreak ever happened, but then people with powers started appearing.
The virus wasn’t meant to just kill humans, it was meant to prepare the planet for harvest.