The photos of the victims are horrifying. With their bodies covered with huge pustules that will have left large craters in their skin forever (if they survived), the victims of smallpox suffered unimaginable agony. Along with the pus-filled lesions came crushing headaches, delirium, extensive bleeding, crippling backaches, chronic fatigue, unstoppable diarrhea and vomiting, bone infections, pneumonia, and fevers that oftentimes ran above 104 degrees. Highly contagious, it is easily spread through droplets expelled by sneezing, coughing or breathing, and it can also be spread through contact with an item touched by an infected person, like a set of keys, cell...