I am speaking to the fact that DengVax contained no components recognizeable as a poison, but its effect on the recipients was such that it might as well have have been. And the point about delayed awareness of problems is that the lethal side effect - ADE - did not manifest until the children were exposed to a different strain of DengueThose who claim that the above ingredients represent (or include) a "poison" bear the burden of proof here.
To claim that enough testing was done to rule out any such effect is hubris of the worst kind, and that doesn't even take into account the cardiac inflamation and abnormal clotting which are occurring in sufficient numbers that they would need to be listed as side effects if they had occurred during controlled trials in the pre-EUA phase