"Do you know why no magically activated viruses are currently being used commercially or have even been developed?" she asks, her voice deceptively calm. "At first blush, it would seem to be an incredibly rich and useful technology. For tumor treatment or control, perhaps. Or control of other diseases. The virus is insinuated into the body, but triggered only at the opportune moment—when a symptom manifests itself, perhaps, or when the virus is concentrated in the cancerous tissue." She shrugs. "Those are only a few possibilities, ones that came to my mind over the last hour. I’m sure any viral geneticist or medical researcher could come up with thousands more. So why aren’t we seeing this technology in widespread use?