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
The Stolen Invention Deering's invention and is greatly impressed with it. Cobleigh offers Deering a small amount of money for the invention, but Deering refuses to accept it. Then Cobleigh, having failed to get his invention by fair means, determines to secure it by foul. He drugs Deering, and the result of the poison is to make the inventor temporarily insane. While in this condition, Cobleigh has Deering transferred to an insane asylum. Then he forges the inventor's name to the bill of sale and thinks that his crime will never be discovered. Deering's daughter, Grace, failing to induce her sweetheart, Tom Reynolds,