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
First of His Name reads: "Only slow by "Game of Thrones" standards, "First of His Name" demonstrates how carefully constructed this show has been since season one." Matt Fowler of "IGN" gave the episode a 9/10 writing that the episode "gave us a much-needed look back at some past events on the series." He highlighted the revelation that Littlefinger's actions "put the story of the entire series into motion." Erik Adams of "The A.V. Club" gave the episode an A and praised the writers for their focus on the female characters. First of His Name "First of His Name" is the fifth episode of