This is just cheese. No common sense to it at all. Tens of thousands could be aspirated with smallpox and we would still not have a global epidemic.
If there were truth to the claim, even the vaccine should be avoided. If 100 million are given the vaccine, at least 10,000 will die or have long lasting side effects. A few thousand will actually contract smallpox or worse. ONE person could threaten us all is just too rich!