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,
Vaccination and religion missionaries vaccinated Northwest Coast Native Americans during an 1862 smallpox epidemic. In the UK, a number of Vaccination Acts were introduced to control vaccination and inoculation, starting in 1840, when smallpox inoculation was banned. The 1853 Act introduced compulsory free infant vaccination enforced by local authorities. By 1871, infant vaccination was compulsory and parents refusing to have their child vaccinated were fined and imprisoned if the fines were not paid. Resistance to compulsion grew, and in 1889, after riots in Leicester, a Royal Commission was appointed and issued six reports between 1892 and 1896. It recommended the abolition of cumulative