I wonder if this is a textbook for a class about the importance and influence of diseases? It is shaped like one, rather large with really good illustrations (scary ones, some of them). If you have any interest in the really important diseases that lost battles and wars, stopped conquerors and settlers and held back entire peoples from developing into modern societies, read this book! Well researched, covering all of the controversies and scientifically clear, this book traces the diseases and how they attack the body, then traces the history of the diseases and how they influenced the global history of mankind. Readable and fascinating!!