“No, Your Grace. I’ve found flanking regions of rhinovirus genetic material around the cystic fibrosis locus indicated in the holo here, and I think I can say with some assurance that it didn’t get there accidentally.”

“Rhinovirus?”

“The vector for the common cold,” Allison said dryly, “which could have offered several useful advantages to the med teams who made use of it. For one thing, with your people so tightly confined in the limited air-filtered habitats they could build, an aerosol vector like this would be very easily spread. Given the fact that I’ve found absolutely no mention of it anywhere in the records, I might also hazard the guess that the project was kept confidential at the time—possibly to avoid raising hopes if, in fact, it should fail. Or there could have been other reasons. And if there were, spreading the alteration via ’a cold’ would have the advantage of maximum concealability, as well.”

“Indeed it would have, and there could well have been ’other reasons’ to do such a thing quietly,” Sullivan agreed, and it was his turn to smile crookedly. “Despite my own analysis of why Father Church does not believe in suppression, not everyone in our history would have agreed with me, and no doubt there have been times when our freer thinkers found that… discretion was indicated. As I’m sure you’ve discovered in the course of your research, My Lady, many of our Founders were zealots. Heavens, look at those lunatics who launched the Civil War four hundred years later! However trying our own times may be, they do not compare to the Tests which faced the Founders, and it would certainly have been possible that the Founding Elders might have feared that some of the more blindly faithful among their flock would have reacted badly to the notion of such a thing as permanently modifying their own bodies and those of all their descendants.”

“As you say, Your Grace,” Allison murmured, then shrugged. “At any rate, we might think of this as a sort of weapon of beneficent biological warfare, an agent designed to modify the genetic material of your people in order to give them a fighting chance at surviving their environment. Unfortunately, it looks like it was a fast and dirty method, even by the standards of then-current technology.”

Sullivan frowned, and she shook her head quickly.

“That wasn’t a criticism, Your Grace! Whoever managed this was clearly working on a shoestring, with limited resources. He had to do the best with what he had, and what he managed was brilliantly conceived and clearly executed effectively. But I suspect that the need for speed, coupled with extremely limited facilities, prevented his team from carrying out as careful an analysis as they would have wished, and it looks like the vector carried a second, unintentional modification which they failed to recognize at the time.”

“Unintentional?” Sullivan’s frown was deeper now, not in displeasure but in thought, and Allison nodded.

“I’m certain it was. And the nature of their problem no doubt helps explain what happened. You see, whoever designed this modification had to make the adaptive mutation inheritable. Simply modifying the gene in those actually exposed to the rhinovirus wouldn’t work, because it would have been a purely somatic mutation, which means it would have died with the first generation of hosts. To keep that from happening, he—or they—had to cross from the somatic to the germ line—modify the rhinovirus to cross the mucosal barrier and show a predilection for primordial germ cells in the host’s ovaries and testes—in order to pass it on to the first generation’s offspring. What had to be accomplished was analogous to, oh, the mumps virus. That infects the salivary glands, but also attacks the ovaries and testes and can account for some cases of male infertility.”