"A freighter carrying fertilizer enters a port and docks. In fact, the freighter has mixed the fertilizer with a catalyst to create a massive explosion that also disseminates a large amount of radiological and/or biological agent. Response focuses on the damage done by the resulting explosion. The scattering of a radiological or biological weapon over the area is only detected days later."

Sounds awful, right? It's a lot more fun when you put in pop TV terms, as the Center for Strategic and International Studies has done here, with their laugh-a-minute white paper, "Biological Warfare and the Buffy Paradigm"