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
Grass for His Pillow before the pass is closed by snow. Once Spring thaws the snow, Kaede excuses herself from Fujiwara, stating her intention to visit Arai, her overlord, to discuss her future. He reluctantly agrees, and she travels via Terayama, as she has heard that Takeo is there. They meet, and as Takeo is under a death sentence from the Tribe, Kaede sends Shizuka and Kondo away. Against advice, Takeo and Kaede marry at Terayama. Grass for His Pillow Grass for His Pillow is the second novel in Lian Hearn's popular Tales of the Otori trilogy, published in 2003. The events in the