Vaccination disease people tried to prevent by inoculation and was the first disease for which a vaccine was produced. The smallpox vaccine was invented in 1796 by English physician Edward Jenner and although at least six people had used the same principles years earlier he was the first to publish evidence that it was effective and to provide advice on its production. Louis Pasteur furthered the concept through his work in microbiology. The immunization was called "vaccination" because it was derived from a virus affecting cows ( 'cow'). Smallpox was a contagious and deadly disease, causing the deaths of 20–60% of
Vaccination policy in conjunction with the Spanish Medicines Agency, outlines specifications for vaccination schedules and policies and provides a history of vaccination policies implemented in the past, as well as legislature pertaining to the public currently. Spain's Constitution does not mandate vaccination, so it is voluntary unless authorities require compulsory vaccination in the case of epidemics. In 1921 vaccination became mandatory for smallpox, and in 1944 the Bases Health Act mandated compulsory vaccination for diphtheria and smallpox, but was suspended in 1979 after the elimination of the threat of an epidemic. The first systematic immunization schedule for the provinces of Spain was