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
Texans for Vaccine Choice TFVC is not "anti-vaccine" but "pro vaccine-choice". Texans for Vaccine Choice Texans for Vaccine Choice (TFVC) is a political action committee in Texas which advocates for exemptions to vaccination requirements. TFVC has been criticized as anti-vaccine by David Gorski and some news outlets. Texans for Vaccine Choice was founded in 2015 by a group of mothers, lead by Jackie Schlegel, who opposed legislation proposed by state representative Jason Villalba (R-Dallas) which would have eliminated conscientious exemptions to vaccination requirements in the state of Texas. Referring to this bill, TFVC executive director Jackie Schlegel said “This is Texas. We believe in