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A vaccination schedule is a series of vaccinations, including the timing of all doses, which may be either recommended or compulsory, depending on the country of residence.
A vaccine is an antigenic preparation used to produce active immunity to a disease, in order to prevent or reduce the effects of infection by any natural or wild pathogen. Many vaccines require multiple doses for maximum effectiveness, either to produce sufficient initial immune response or to boost response that fades over time. Vaccine schedules are developed by governmental agencies or physicians groups to achieve maximum effectiveness using required and recommended vaccines for a locality while minimizing the number of health care system interactions. Over the past two decades, the recommended vaccination schedule has grown rapidly and become more complicated as many new vaccines have been developed.
Some vaccines are recommended only in certain areas (countries, subnational areas or at-risk populations) where a disease is common. For instance, yellow fever vaccination is on the routine vaccine schedule of French Guiana, is recommended in certain regions of Brazil but in the United States is only given to travelers heading to countries with a history of the disease.Update on Yellow Fever in the Americas, http://www.paho.org/english/SHA/be_v21n2-yellowfever.htm, the Epidemiological Bulletin, Vol. 21 No. 2, June 2000, Pan American Health Organization, accessed July 18, 2007 In developing countries, vaccine recommendations also have to consider poor health care access, high vaccine cost and issues with vaccine availability and storage. Sample vaccinations schedules discussed by the World Health Organization show a developed country using a schedule which extends over the first five years of a childs life and uses vaccines which cost over $700 including administration costs while a developing country uses a schedule providing vaccines in the first 9 months of life and costing only read more at » http://en.wikipedia.org/wiki/Vaccination+schedule
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