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Lisa tapped the first screen. “Here is the trans form, or the bad form of the virus. It infects bacteria and turns them into monsters.” She waved to the other screen, depicting the virus found inside Susan’s skull. “Here is the cis form, or the good virus that heals.”

“Cis and trans,” Miller mumbled. “Good and bad.”

Lisa elaborated her theory. “As we already know, the trans virus toxified bacteria in order to weaken the blood-brain barrier, thus allowing it to penetrate that virgin territory of the inner skull. It even brought along some company.”

“The cyanobacteria,” Miller said. “The glowing bacteria.”

“And normally the toxins produced by the bacteria corrupted the brain in such a manner that it triggered catatonic excitement with psychosis. But in Susan’s case, something else happened. The virus, when it hit her brain fluid, somehow altered. Changed from its evil trans form over to its beneficial cis form. And once altered, the new virus swept out and began reversing all the damage done by its evil twin, healing the patient and sending her into a deep recuperative stupor, contrary to the manic excitement phase of the other patients.”

“Even if you’re correct,” Henri said, “which I believe you are, what was so special about Susan’s biochemistry to trigger this change?”

Lisa shrugged. “I wager over the next days or weeks, we’ll see a handful of other patients make the same transformation. Susan was infected five weeks ago. So it may be too soon to judge. But I think it’s still a very rare event. A random quirk in her genetics. For example, are you familiar with the Eyam phenomenon during the Black Plague?”

Chénier raised her hand as if in a schoolroom. “I am.”

Lisa nodded. Of course, an infectious disease expert would know the story.

Chénier explained, “Eyam was a small village in England. Back in the sixteen hundreds, the Black Plague struck the village. But after a year, most of Eyam still lived. Modern genetic studies revealed why. A rare mutation was present in the villagers. In a gene called Delta 32. It was a benign defect that was passed from one family member to another, and in such an isolated township, inbred as they were, a good portion of the town had acquired the mutation. Then the plague struck. And this strange little mutation, just hanging about, saved them. Made them immune.”

Devesh spoke up. “Are you suggesting our patient carries the Delta 32 equivalent against the Judas Strain? Some random protein that enzymatically switched the virus in her from trans to cis.”

“Or maybe it’s not that random,” Lisa mumbled. She’d been struggling with this question ever since her discovery of the altered virus. “Only a very small percentage of our DNA is actually functional. Only three percent, in fact. The other ninety-seven percent is considered genetic junk. It doesn’t code for anything. But some of that junk DNA bears a remarkable resemblance to viral code. The current belief is that such coding might serve a protective role, to help us survive future disease.”

As Lisa continued, she pictured the body of Susan’s friend, attacked and eaten. “Like cannibalism, for example.”

Her strange statement drew everyone’s eyes from the monitors.

Lisa elaborated. “Genetic markers found worldwide show that most humans carry a specific set of genes against diseases that can only be acquired by eating human flesh. These findings suggest that our ancient ancestors might have all been cannibals. Maybe Susan has a similar genetic marker to protect her brain against the attack by the Judas Strain virus. Something left over from our long-lost genetic history. Something buried in our collective past.”

“Intriguing as usual, Dr. Cummings.” Devesh rocked back and forth on his toes, plainly excited. “But whether the transformation was random chance or was triggered by some viral genetic marker from our past…it doesn’t truly matter. Now that we know about this new virus, we can use this knowledge to produce a cure!”

Chénier looked less