Are these the “virals” that our forebears warned us of? And if they are, how did these dramatic changes come about? To this there appears to be an answer.

Next slide?

On the left we see the EU-1 strain of the GC virus, taken from the body of the so-called “frozen man,” a polar researcher who succumbed to the infection a millennium ago. This virus, we believe, was the primary biological agent of the Great Catastrophe, a microorganism of such robustness and lethality that it was able to kill its human host within hours and virtually wiped out the world’s population in fewer than eighteen months.

I draw your attention now to the virus on the right, which was extracted from thymus tissue of one of the two corpses found in the Los Angeles basin. We now believe this to be a precursor to the EU-1 strain. Whereas the virus on the left contains a considerable quantity of genetic material from an avian source—more specifically, Corvus corax, known as the common raven—the one on the right does not. In its stead we find genetic material linking it to an altogether different species. Though our teams have yet to identify this organism’s genetic author, it bears some resemblance to Rhinolophus philippinnensis, or the large-eared horsehoe bat. We are calling this virus NA-1, or North America–1.

In other words, the Great Catastrophe was caused not by a single virus but by two: one in North America and a second, descendant strain that subsequently appeared elsewhere in the world. From this fact, researchers have built a tentative chronology of the epidemic. The virus first emerged in North America, infiltrating the human population from an unknown vector, though in all likelihood a species of bat; at some later point, the NA-1 virus changed, acquiring avian DNA; this new, second strain, far more aggressive and lethal, subsequently made its way from North America to the rest of the world. Why the EU-1 strain failed to bring about the physical changes caused by NA-1 we can only speculate. Perhaps in some instances it did. But by and large, the consensus of opinion is that it simply killed its victims too quickly.

What does this mean for us? Put succinctly, the “virals” of “The Book of Twelves” are not fiction. They are not, as some have claimed, a mere literary device, a metaphor for the predatory rapaciousness of North American culture in the B.V. period. They existed. They were real. “The Book of Twelves” describes these beings as a manifestation of an almighty deity’s displeasure with mankind. That is a matter for each of us to weigh in the privacy of his or her own conscience. So, too, is the story of the man known as Zero and the twelve criminals who acted as the original vectors of infection. Speaking for myself, the jury is still out. But in the meantime, we know who and what the virals were: ordinary men and women, infected with a disease.

But what of humanity? What of the story of Amy and her followers? I turn now to the matter of survivors.

Next slide?

As everyone here certainly knows, it has been an exciting year in the field—very exciting, indeed. Excavations of several newly discovered human settlements in the North American West, dating from the first century of the Quarantine Period, have begun to bear fruit. Much of this work is still in its infancy. Yet I think it’s no overstatement to say that what we’ve uncovered in the last twelve months alone has signaled a truly radical reconceptualizing of the period.

Our understanding of the early Quarantine Period has long presupposed that no human inhabitants remained in North America between the Equatorial Isthmus and the Hudson Frontier Line following the year zero. The disruption to the continent’s biological and social infrastructures was believed to have been so complete as to render the continent incapable of supporting human life, let alone any kind of organized culture.

We now know—and once again, the last year has been extraordinary—that this view of the Quarantine Period is incomplete. Indeed, there were survivors. Just how many, we may never know. But based on the findings of the last year, we now think it possible, indeed very likely, that they numbered in the tens of thousands, living in a number of communities throughout the Intermountain West and the Southern Plains.

The size and configuration of these settlements varied considerably, from a mountaintop village housing just a few hundred inhabitants to a city-sized compound in the hills of central Texas. But all give evidence of human habitation well after the continent was thought to have been depopulated. These communities also share a number of distinctive traits, most significantly a culture that was both classically survivalist and, paradoxically, deeply attentive to the social practice of being human. Within these protected enclaves, the men and women who survived the Great Catastrophe, and generations of their descendants, went about their lives, as men and women do. They married and had children. They formed governments and engaged in trade. They built schools and places of worship. They kept records of their experience—I am speaking, of course, about the documents known to everyone in this room, indeed to people throughout the settled territories, as “The Book of Sara” and “The Book of Auntie”—and, perhaps, even sought contact with others like themselves, beyond the walls of these isolated islands of humanity.