The book does not match the title. This is not the same kind of story as The Demon in the Freezer or The Hot Zone. It should be called other generally interesting stuff written by Richard Preston in his narrative style. That said, as a science geek I enjoyed the book, but if you are looking for more scary virus stuff based on some of his other writings this may not be exactly what you want.
A great set of well researched stories from a thorough journalist... I loved it!