It's odd that none of these supposed medical conspiracies seem to have a single reliable source. Saying that all evidence was destroyed is the easiest counterargument. Yet it is also extremely impractical. People are led to believe, as with every conspiracy theory, that it's simple to completely cover up all traces of an incident.
But, you may argue, there were people there who knew about it before it disappeared from history. Why those people completely incapable of recreating the results or at least sending off enough information to get research going again? If there is indeed a simple cure then why haven't they given all of the information they know to a group who is willing to finish the research?
Conspiracy theories are largely nothing but hoaxes meant to prey upon the questioning human mind. I welcome anyone with a credible source on any of these theories to post about it. Nobody in this thread has given any evidence thus far.