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
For the Term of His Natural Life that he will fetch his lawyer to alter his will so that Richard receives no inheritance. When Richard leaves, he comes across a murder scene: his biological father, Lord Bellasis has been murdered, and Richard witnesses Sir Richard walking away from the scene of the crime. The police come and lock up Richard, who now gives his name as Rufus Dawes (which is used for the remainder of the book), for the murder of Lord Bellasis. Additionally, Sir Richard returns home and dies straight away, possibly of a heart-attack, without altering his will. Rufus Dawes/Richard Devine never finds this out.