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 Bruce-Joy and travelled to America twice in his life. Albert Bruce-Joy Albert Bruce-Joy (21 August 1842 – 22 July 1924) was an Irish sculptor working in England. His original surname was Joy but he became known under his hyphenated name Bruce-Joy later in life. He was the brother of the painter George W. Joy. Son of William Bruce Joy, MD, Bruce-Joy was born in Dublin but educated in Offenbach, Paris and at King's College London. He trained as a sculptor with John Henry Foley at the National Art Training School, South Kensington, and the Royal Academy Schools. He began exhibiting at