I have found a newer edition of the 4th cited source in your wikipidea article over here:
http://nitroflare.com/view/CA9FF8B215AE805/Am-Medicine.com-180915-m4.pdf/free
It will be interesting to see exactly the statistics and the context and if they too are simply unsubstantiated claims or are actually facts.
Yes, yes ... I will have to do an articlw on the REAL history of smallpox.
What we have been told is mostly myth.