"All right," Celi says, "good debrief. But before everyone disappears, I just received a new warning order. Details haven't been promulgated from the Colonel yet, but here's the background.
"There's been an outbreak of MacMillan's Disease in some of the urban centers on Cerberus. At first our medics thought it was the same strain we saw on other worlds in the Dog Star system, but this is something new. It's a nasty local pathogen for which humans are particularly vulnerable, but there are few symptoms until the disease has reached an advanced stage—meaning it can spread unchecked through an entire population. We have a vaccine, and a supply ship is en route from Anubis with enough doses to inoculate the entire civilian population. It'll also have a cure for those already infected, but not enough to stop a full-blown outbreak. The problem is, there's a lot of suspicion among the locals about Terran medicine and we expect there to be resistance to our efforts to administer the vaccine. Our job is going to be to ensure that the civilians receive the treatment before the disease wipes them out."
You have to shift your mindset pretty quickly—today you were fighting the Cerberans and tomorrow you're helping cure them? You remember MacMillan's Disease from an outbreak last year at the Astral College. Nasty stuff, but perfectly containable if caught in time with modern medicine.