[Nuc1]

True but it was far more lethal to indigenous peoples that had never been exposed. Essentially what the world is comprised of now. Small Pox is one disease that really worries me. Viral and still around for study. Not to mention grave yards. Probably some virulent stuff left in there. Oh and let's not forget the weaponized stuff.

[HangnJudge]

Yup...

http://en.wikipedia.org/wiki/Smallpox

In 1992 Soviet defector Ken Alibek confirmed that the Soviet bioweapons program at Zagorsk had produced a large stockpile—as much as twenty tons—of weaponized smallpox (possibly engineered to resist vaccines), along with refrigerated warheads to deliver it. It is not known whether these stockpiles still exist in Russia.

With the breakup of the Soviet Union and unemployment of many of the weapons program's scientists, there is concern that smallpox and the expertise to weaponize it may have become available to other governments or terrorist groups who might wish to use virus as means of biological warfare.