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 policy immunity against it. This protects those unable to get the vaccine due to medical conditions, such as immune disorders. Vaccine-preventable diseases remain the most common cause of childhood mortality with an estimated three million deaths each year. Each year, vaccination prevents between two and three million deaths worldwide, across all age groups, from diphtheria, tetanus, pertussis and measles. With some vaccines, a goal of vaccination policies is to eradicate the disease – make it disappear from Earth altogether. The World Health Organization coordinated the effort to eradicate smallpox globally through vaccination, the last naturally occurring case of smallpox was in