A large volume of HeLa cells were needed for the testing of Salk's polio vaccine, prompting the National Foundation for Infantile Paralysis (NFIP) to find a facility capable of mass-producing HeLa cells.[22] In the spring of 1953, a cell culture factory was established at Tuskegee University to supply Salk and other labs with HeLa cells.[23] Less than a year later, Salk's vaccine was ready for human trials.[24]