In some fictional Caribbean island nation, there is a plague killing small children. The problem is that it's a virus--which is hard to treat. And, it's a problem because the drug that MIGHT work is not FDA approved. So, Quincy goes into angry doctor mode and crusades to get the US government to release the drug. To make matters worse, the pro-American leader of this county (Robert Loggia) is barely holding on to power--and the opposition leader (David Opatashu) seems eager to take advantage of the situation.
If you think about it, the whole idea of Quincy being sent to some foreign nation (especially when an epidemiologist would be a much more logical choice than a coroner) is silly. It shows that the writers were trying to come up with ideas--ANYTHING to make the show more interesting. It's not a bad episode but it is a contrived one.