The 1930's were years of therapeutic advances and much trust. It was amid this decade the revelation was made that there were no less than two separate strains of polio infection. (It was later established that there were three strains). Two doctors attempted to build up a polio vaccine. These efforts finished in 1935 with field trials for immunizations created by Maurice Brodie and John Kollmer. Both Doctors wanted to be the first to develop a vaccine against Polio. Dr.Brodie composed his from an emulsion of the ground-up spinal strings of contaminated monkeys. He endeavored to deactivate the infection by presenting it to formalin (a formaldehyde blend). This formalin-inactivated mixture was initially attempted with twenty monkeys, then with
