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) and Me (Babe)", which closed former Beatle Ringo Starr's 1973 album "Ringo". In the lyrics to "His Name Is Legs", Harrison biographer Simon Leng recognises the same "nonsense word games" favoured by Monty Python. Leng comments that the latter's composition "The Lumberjack Song" particularly resonated with Harrison during this period, as he sought to challenge the public's perception of him as a Beatle, in the same way that Michael Palin's character in the Python song challenged the stereotypes associated with an "all-action" lumberjack. Harrison taped "His Name Is Legs (Ladies and Gentlemen)" during sessions for his 1974 album "Dark Horse",