There is a book called Peeps by Scott Westerfield. It is about vampires and how they are parasites positives. In addition, Westerfield adds a few small chapters about some parasites that lives with us in our daily lives. The book is a bit slow, but I thought it had very interesting view of vampires. Here's a the description and picture of the book:
Cal Thompson is a carrier of the parasite that creates vampires. He was infected against his will and is now a hunter to hunt down others who have been infected and need help. After he chases down all of the people he inadvertently infected he goes searching for the one who forced this life upon him. Through this process he meets Lace, a girl who lives in the same apartment building of the girl he is looking for, and discovers she has noticed that something is not right in her building.
As Cal continues looking for clues as to what is really going on in the vampire community, he finds that Lace is difficult to get rid of and demands he tell her the truth about what he does for a living. Instead of fleeing like most people would, Lace tries to help him find the mysterious Morgan who began Cal’s journey and what she finds surprises them both.