Biohorror Subgenre was Not Always Applauded

In my book, The Things that Keep Us Up At Night --Reel Biohorror, I trace the development of the biohorror subgenre and the exponential increase in movies of this subgenre since the 2001 anthrax attacks, bird flu, etc.  But I did not know that a screenplay known as the "greatest screenplay never made" was about the Black Death and considered far too depressing and vile to be made in America at the time.  This was shared with me by commenter, Dennis Hackin, a screenwriter and someone who is immensely knowledgeable about the movie industry:
http://www.elisbergindustries.com/blog/todays-huffery-the-greatest-screenplay-never-made