Polio vaccine is usually provided in vials containing 10–20 doses of vaccine. A single dose of oral polio vaccine (usually two drops) contains 1,000,000 infectious units of Sabin 1 (effective against PV1), 100,000 infectious units of the Sabin 2 strain, and 600,000 infectious units of Sabin 3. The vaccine contains small traces of antibiotics—neomycin and streptomycin—but does not contain preservatives. In a generic sense, vaccination works by priming the immune system with an 'immunogen'. Stimulating immune response, by use of an infectious agent, is known as immunization. The development of immunity to polio efficiently blocks person-to-person transmission of wild poliovirus, thereby protecting
Albert Sabin to Sabin, as well as assuming the middle name Bruce. Sabin received a medical degree from New York University in 1931. He trained in internal medicine, pathology, and surgery at Bellevue Hospital in New York City from 1931–1933. In 1934, he conducted research at The Lister Institute for Preventive Medicine in England, then joined the Rockefeller Institute for Medical Research (now Rockefeller University). During this time, he developed an intense interest in research, especially in the area of infectious diseases. In 1939, he moved to Cincinnati Children's Hospital in Cincinnati, Ohio. During World War II, he was a lieutenant colonel