On the first of December 2019, the World Health Organization (W.H.O.) held the “Global Vaccine Safety Summit.”
It is a complicated business bringing safe and effective pharmaceuticals to market.
The short video gives you an example of the issues involved as discussed by vaccine experts.
Maybe you can read between the lines.
The video link https://www.youtube.com/watch?v=s2IujhTdCLE&feature=youtu.be
Del Bigtree's YouTube website just keeps publishing the facts. Got to love it when he uses government / Big Pharma's own facts.