The Soviet Union had tons of biological weapons, including smallpox, before, during and after the implementation of the Biological Weapons Convention treaty. People who worked in those laboratories and the associated germ warfare production facilities sometimes accidentally carried product home unwittingly, with predictable consequences.
Any hope for eradication is lost when somewhere, somehow, an as-yet-unopened bottle of bad stuff remains forgotten or hidden. And this is without considering bad intent.
Any hope for eradication is lost when somewhere, somehow, an as-yet-unopened bottle of bad stuff remains forgotten or hidden. And this is without considering bad intent.
So keep samples where you can get them quickly.