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) Newmark, all of whom were part of Harrison's 1974 tour band. The song's arrangement reflects Harrison's adoption of the funk genre. As with the album's humorous artwork, the inclusion of "His Name Is Legs" on "Extra Texture" marked a rare example of light-heartedness among a collection of mostly downbeat songs. Several commentators view the track as an indulgence by Harrison. These detractors cite the in-joke nature of the composition, together with the largely unintelligible vocals on the recording. Harrison acknowledged that the song's appeal might be limited to "maybe two people". Although often noted for the serious, religious nature of