I think they manufactured the Flu for sure. Grew up not having an issue and no vaccines needed, people just caught the flu. And then all of the sudden they push hard with a flu vaccine.
Maybe that is what bloodletting was all about. To evacuate your body from evil?
There are studies right now on the flu vaccine and it's role in susceptibility for Chinese Flu. Apparently there is a correlation. Vaccines only make you weaker. Herd Immunity is where it's at. Survival of the fittest.