After small pox was eradicated in the late sixties and early seventies only the CDC in Atlanta and a Soviet lab in Moscow were allowed to keep live viruses. Did the F'ing Soviets screw around with this virus and have they had a security breech ? I wonder what classified information our government knows. I doubt they would be ordering tens of millions of vaccines if they knew the Moscow viruses were secure and unmolested.
Unfortunately, some vaccines have a tiny rate of significant/tragic complications. However, you can't live life worrying about the one in a million tragedy when you are trying to prevent known pestilence such as polio, pertussis, small pox, etc. I am a physician and have had all my children vaccinated and also get my flu shot every year. Influenza kills thousands every year (mostly the elderly and debilated). Could my family or I have a tragic idiosyncratic reaction to a vaccine ? Sure, but I'll take those odds.