Anthrax vaccines known to result in far less scarring, and greatly reduced mortality, in comparison with the naturally acquired disease. The English physician Edward Jenner (1749–1823) had also discovered (1796) the process of vaccination by using cowpox to give cross-immunity to smallpox and by Pasteur's time this had generally replaced the use of actual smallpox material in inoculation. The difference between smallpox vaccination and anthrax or chicken cholera vaccination was that the weakened form of the latter two disease organisms had been "generated artificially", so a naturally weak form of the disease organism did not need to be found. This discovery revolutionized
History of smallpox survivors. In northern Japan, Ainu population decreased drastically in the 19th century, due in large part to infectious diseases like smallpox brought by Japanese settlers pouring into Hokkaido. The Franco-Prussian War triggered a smallpox pandemic of 1870–1875 that claimed 500,000 lives; while vaccination was mandatory in the Prussian army, many French soldiers were not vaccinated. Smallpox outbreaks among French prisoners of war spread to the German civilian population and other parts of Europe. Ultimately, this public health disaster inspired stricter legislation in Germany and England, though not in France. In 1849 nearly 13% of all Calcutta deaths were due to