"Demon in the Freezer" is a true story by Richard Preston which is an overview of the infectious diseases field. It shines its spotlight on Smallpox, and upon the people working on this lethal virus, but the spotlight wanders around quite a bit in doing so, and touching on other issues as it does. But it gives a comprehensible picture nevertheless.
And bonus (!), its less creepy than another of his books, "Hot Zone" which I could only read about one or two chapters of before closing that book.
It does not seem all that in-depth, but there are plentiful interesting anecdotes which will illuminate surprising things about the field.
We should pray that God strengthens the hands and the minds of these researchers who do battle with this terrible demon.