Apocalypse (The Wasteland Chronicles Book 1) – by Kyle West – Kindle Edition

Thirty years after the Ragnarok meteor devastated Earth, humanity survives in sealed underground bunkers. Sixteen-year-old Alex Keener has never seen the sunand in Bunker 108, thats considered a blessing.
When a recon patrol rescues a survivor from a neighboring bunker, they bring back more than they bargained for. The man carries the xenovirus, an alien pathogen that hijacks its hosts and twists them into violent, explosive monsters.
Within hours, Bunker 108 falls. Now Alex is on the surface, alone, unprepared, and hunted. But surviving the Wasteland is only the beginning. The xenovirus didnt arrive with Ragnarok by accident.
Something sent it. And it isnt finished.