In 1951, Dr. Jonas Salk and his team began using Dr. John F. Enders’ methods to grow poliovirus, and soon thereafter, Youngner developed new methods for growing the virus in culture using a technique called trypsinization.

Their work also focused on selecting the best non-neural monkey tissue for growing large quantities of virus. Bennett worked on the inactivation process and the preparation of experimental vaccines, while Lewis worked on all associated monkey studies.