If you’re already familiar with pop science books about diseases, this isn’t really going to surprise you any. It’s competently written, though at times the statistics are a little off (as another reviewer pointed out). I don’t agree that he’s too unduly alarmist, though; our current environmental and social conditions are just about perfect for a pandemic (viral or otherwise) to sweep through the world’s population. If you doubt it, The Great Influenza by John M. Barry should disabuse you of that notion, rapidly. And our world is more interconnected now, not less.
I hoped that this might be a little more in depth, given Wolfe being a biologist and all, but there’s nothing that really elevates it above other pop science books available. It’s honestly rather forgettable.