Mozart and smallpox the imperial family were successful, and led to greater public acceptance for the procedure. Smallpox struck the Mozart family again in the next generation: Nannerl's eldest son Leopold and two of her stepchildren caught the disease during an outbreak in the Salzburg area in 1787. All three children survived. In 1796, the discovery of vaccination—the use of the related cowpox virus to immunize against smallpox—by Edward Jenner revolutionized the ability of medicine to deal with smallpox. Vaccination reached Vienna around 1800, when yet another local epidemic created impetus for its adoption. One of the doctors trained in the Vienna campaign,
History of smallpox he challenged the state's authority on forcing people to receive vaccination. His case was lost at the state level, but Jacobson appealed the ruling, and so, the case was taken up by the Supreme Court. In 1905 the Supreme Court upheld the Massachusetts law: it was ruled Jacobson could not refuse the mandatory vaccination. In Canada, between 1702 and 1703, nearly a quarter of the population of Quebec city died due to a smallpox epidemic. There is evidence that smallpox reached the Philippine islands from the 4th century CE onwards – linked possibly to contact between South East Asians and