A smile tugged at the edges of Kelly’s lips. “I could start listing the index cases for the known reservoir conditions, but I doubt you really care, and they aren’t that applicable in this situation. They showed up one by one, they didn’t follow any perceptible pattern, and they were as incurable as the parent virus. That’s what matters to the story: Once you have a reservoir condition, you have it for the rest of your life.”

She’s got that right, said George bitterly. She developed retinal Kellis-Amberlee while we were little, and she had it until the day she died. Kids in our high school used to tease her about it and threaten to steal her sunglasses. They never did, though. There was always too much of a chance that her “cooties” might be contagious.

That’s bullshit, by the way. You can’t catch the live form of Kellis-Amberlee unless you come into contact with it, and George didn’t sweat the live virus. It just lived inside her eyes, all the time. Waiting for the day when it would get loose to play with the rest of her body.

Which it eventually did.

I had to force myself to start talking again, before I could really start dwelling on what had happened to George. This wasn’t the time. “So what’s the moral of our story?” I asked, relieved when my voice sounded halfway natural. “Reservoir conditions suck?”

“Reservoir conditions represent a viral behavior with no known purpose or explanation,” contributed Dave. Everyone but Kelly turned to look at him. He shrugged. “I took a couple of virology courses before I went to Alaska. It seemed like it might help with that whole ‘not dying’ thing.”

“Ah.” Dave was in Alaska last year when half the staff died. He was probably safer on the frozen, zombie-infested tundra than we were in Sacramento. There was something ironic about that. I paused. “Wait, are you saying no one knows what the reservoir conditions do?”

“There are theories.” Kelly sounded suddenly evasive. I eyed her. Her expression was practically a mask; with her eyes closed, she could have been thinking anything at all.

She should get some sunglasses if she wants to pull that trick, said George.

I didn’t say anything. I just waited.

Kelly gave a small shake of her head and continued: “I’ve spent the last year studying reservoir conditions. The CDC tracks anyone with a KA-related medical condition, but nothing’s ever really been done with the data. So I thought I’d start.”

“Hey, that’s not true,” I protested. “George was in all kinds of studies. There was always some new specialist asshole wanting to poke her in the eyes and see what happened.”

“There have been studies of the individual kinds of reservoir conditions, but nobody’s really looked into the syndrome as a whole.” Kelly sank, if anything, farther back into the couch. “Why does it happen? Why does it happen in specific parts of the body? How is it that the virus is contained? Everything we know says that anyone with a reservoir condition should amplify immediately, but they don’t. They just keep going until they die. It doesn’t make sense.”