Parasites are really fascinating critters. They continue to amaze me. I have read one book and am on another. The current book is Parasite Rex by Carl Zimmer. He is a terrific science writer for the New York Times. Has written a number of great books. Check out some of his other works at https://www.goodreads.com/search?q=Carl+Zimmer
The first book was I Contain Multitudes by Ed Yong. He has a great TED Talk below. He has a number of other talks on YouTube. Goodreads also has a section on this book.