An Ant in the Apocalypse

After a biochemical disaster, only thirty or forty thousand people in the entire world escaped infection. They were P-type blood carriers, rarer even than people with panda blood. But when the dead suddenly began to turn, panic and confusion claimed the lives of many who had been lucky enough to survive. The actual number of survivors in the early days of the outbreak was probably even lower. And how many of those who made it through by sheer luck are still alive today?! As the protagonist fights to survive, he uncovers the cause of the outbreak: humanity's history, forged in blood and tears, had laid the groundwork for today's catastrophe half a century ago. The past is gone. The key to surviving is reclaiming the faith we once lost...