Smallpox one-third of the cases resulted in blindness. These deaths included those of four reigning monarchs and a queen consort. In the 20th century smallpox killed 200-300 million people. Edward Jenner discovered in 1798 that vaccination could prevent smallpox. In 1967, the WHO intensified efforts to eliminate the disease. Smallpox is one of two infectious diseases to have been eradicated, the other being rinderpest in 2011. The term "smallpox" was first used in Britain in the 15th century to distinguish the disease from syphilis, which was then known as the "great pox". Other historical names for the disease include pox, speckled
German retribution against Poles who helped Jews possible to organise public protests against deportations of the Jewish population. Calculations by Teresa Prekerowa show that only 1% to 2.5% of the adult Polish population was involved in helping Jews. However, the number of helpers was also very small in the countries of Western Europe - although hiding Jews there was associated with an incomparably lower risk. Assuming the percentage of the population of European countries, which in 1945 was made up of Jews who survived the Holocaust, Poland did not differ from the average in other occupied states. On the other hand, in the Netherlands, where few Jews