"(E)xtensive microbiological studies were negative" - and you guys are still 'fishing' around in hopes of finding death by Inhalation Anthrax ...
Will it surprise you at all when your fishing turns out to have been done in 'a dry hole'?
'course, the crowd you sell and market to won't "catch" this aspect - by then you'll be on to the next 'dry hole' in your search for grand conspiracies through the tea-leaf interpretation of un-connected events except that they ocurred in the same time frame ...