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
His Name Is Legs (Ladies and Gentlemen) including "Time Bandits" (1981), "The Missionary" (1982), "A Private Function" (1984) and "Nuns on the Run" (1990). Leng recognises an increasing Python-based comedy influence in Harrison's songwriting and musical arrangements, beginning with his 1979 track "Soft-Hearted Hana" and subsequently including "Save the World", with that song's "groove … horn charts and moog riffs" reminiscent of "His Name Is Legs", and "Greece". Following his guest appearance on "His Name Is Legs", Smith became part of a coterie of local musicians known as the Henley Music Mafia, which also included Harrison, Alvin Lee, Jon Lord and Joe Brown. Smith appeared in the