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,
To the Youth in Western Countries the evolution of terroristic groups like al-Qaeda, the Taliban, and ISIL—"the spawn of such ill-fated pairings with imported cultures." Khamenei also pointed out the "oppressed people of Palestine", who "have experienced the worst kind of terrorism for the last 60 years." For this, he criticised Israel, its allies and international organisations. Twitter accounts that tweeted the letter were reported to have been temporarily suspended for sending spam messages. Some were reactivated with apologies from the network and a warning about sending similar messages again. This sometimes led to multiple resuspensions. To the Youth in Western Countries On 29 November 2015,