Polio vaccine The results of the field trial were announced 12 April 1955 (the tenth anniversary of the death of President Franklin D. Roosevelt, whose paralytic illness was generally believed to have been caused by polio). The Salk vaccine had been 60–70% effective against PV1 (poliovirus type 1), over 90% effective against PV2 and PV3, and 94% effective against the development of bulbar polio. Soon after Salk's vaccine was licensed in 1955, children's vaccination campaigns were launched. In the U.S, following a mass immunization campaign promoted by the March of Dimes, the annual number of polio cases fell from 35,000 in 1953
Salk School of Science in the center. Students will normally exit through the right hand exit. There is school bus service which will bring students to and from school. NYCDOE Notably, the school has established relationships with many neighborhood businesses. If a student experiences trouble outside the school, the student can find refuge in almost any business nearby, and the proprietor will call both the school and 911. This has served as a model for many NYC schools. Salk School of Science The Salk School of Science is a junior high school, located in Lower Manhattan, New York City. It was founded in 1995