Is smallpox set for a comeback?
Until very recently, the pantheons of the world’s religions swelled with gods and divine beings to ward off calamities. And none loomed so large as smallpox. From the inky beginnings of civilization, the disfiguring disease slowly spread over the entire Eurasian continent and North Africa. In the last millennium, smallpox alone has caused 10 percent of all human deaths, including half a billion in the 20th century.
In China, the goddess …