Sweet, Sweet Immunity! - Yahoo! News - Smallpox Immunity Lasts Decades, Study Shows. Not only is this great news for those who have been immunized, it's great news for everyone. Smallpox, if used in a terror attack, will not spread as fast as previously thought. Also, one would think the vaccine will last longer if it isn't necessary to vaccinate everyone.

I was vaccinated as a child when my family visited to Spain and Morocco. In fact, I believe I succumbed to an autoinoculation of vaccinia in my eye.

This is very good news to the people most at risk from smallpox: the immune suppressed.

And perhaps it will reduce the likelihood of a smallpox attack in the first place.