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Promotional materials for "Stop Polio Sunday. Second Dose Jan. 19." A hand drops the vaccine onto a sugar cube.Text: "everyone needs Sabin Vaccine. For complete protection against polio, EVERYONE over two months old needs ALL THREE TYPES of Sabin…

After the influenza virus was finally identified in 1933, researchers immediately started to develop a vaccine. The first flu vaccine was approved for U.S. military use in 1945 and for civilian use in 1946. Unfortunately, the flu has several types,…