Hilary Koprowski he is chair of the department of radiation oncology at Christiana Hospital in Delaware. While at Lederle Laboratories, Koprowski created the world's first polio vaccine, based on an orally administered attenuated polio virus. In researching a potential polio vaccine, he had focused on live viruses that were attenuated (rendered non-virulent) rather than on killed viruses (the latter became the basis for the injected vaccine subsequently developed by Jonas Salk). Koprowski viewed the live vaccine as more powerful, since it entered the intestinal tract directly and could provide lifelong immunity, whereas the Salk vaccine required booster shots. Also, administering a vaccine
Salk School of Science Perry and the vice/ assistant principal is Jennifer Goodwin. The school allows students to bring money to school and at lunch time, to go out and buy themselves lunch at a variety of delis and restaurants. The school shares its building with another school, P.S. 40 which owns most of the building. There is a gymnasium, a cafeteria which is shared between the schools, and 2 floors exclusive to Salk School of Science. Both are located near the top of the building. There are 3 entrances one to the left side of the building, one to the right and one