Extreme cold will kill them, but leave behind viable eggs that hatch quickly when warmed up.. Why do these drugs have to be kept extremely cold, huh? Can also be finely "chopped" and will quickly regenerate..

If I understand the video correctly, the hydra form after injection. The jab contains 'eggs' (or chemical soup which nanobots use to build the synthetic hyrda?)

That would fit with Dr Madej's observations as well.