The book was "ok". Some interesting bits interspersed with somewhat long-winded and boring bits. Only the first third of the book was about parasites. Another third covered microbes and the last third was a wishy-washy diatribe about disgust mixed with germs and politics. There were also some errors which makes me wonder what else the author got wrong. This book also has what appears to be the new method of referencing reference material. It is an absolute pain in the rear-end to figure out which bits of text match up with the relevant reference. This is a book I recommend readers get from the library or borrow from somewhere else if you are curious, not purchasing material.
Parasite Rex by Carl Zimmer is a better book on parasites - it actually has loads more information of a vast variety of parasites. Any other book on microbes would be better.