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Vaccination is the administration of antigenic material (a vaccine) to produce immunity to a disease. Vaccination is generally considered to be the most effective and cost-effective method of preventing infectious diseases. — “Vaccination - Wikipedia, the free encyclopedia”, en.wikipedia.org
Vaccinating a horse against encephalitis, Idaho, 1940. Horses and ponies need annual vaccinations to protect against any number of sicknesses, though the precise vaccines required varies depending on the part of the world where the horse lives and the uses to which the animal is put. — “Horse care - Wikipedia, the free encyclopedia”, en.wikipedia.org
A vaccine controversy is a dispute over the morality, ethics, effectiveness, or safety of vaccinations. Public policy and successive Vaccination Acts first encouraged vaccination and then made it mandatory for all infants in 1853, with the highest penalty for refusal being a prison sentence. — “Vaccine controversy - Wikipedia, the free encyclopedia”, en.wikipedia.org