This film was really interesting because I have just finished reading a non-fiction book called "The Demon in the Freezer" all about smallpox. It was interesting because a number of the people who were giving insight in the film, were also mentioned in the book. The author has also written a book called "The Hot Zone" about Marburg and Ebola virus and the Ebola scare in Reston, VA about 10-15 years ago. The film was extremely factual according to what I read in the book. Very, Very scary folks and an excellent teleplay.