Polio vaccine vaccine became widely available, it supplanted Salk’s injected vaccine, which had been tarnished in the public's opinion by the Cutter incident, in which Salk vaccines prepared by one company resulted in several children dying or becoming paralyzed. An enhanced-potency IPV was licensed in the United States in November 1987, and is currently the vaccine of choice there. The first dose of polio vaccine is given shortly after birth, usually between 1 and 2 months of age, and a second dose is given at 4 months of age. The timing of the third dose depends on the vaccine formulation, but should
Jonas Salk of the Wisest" (1973), "World Population and Human Values: A New Reality" (1981), and "Anatomy of Reality: Merging of Intuition and Reason" (1983). Salk's last years were spent searching for a vaccine against HIV. His personal papers are stored at the University of California, San Diego Library. Salk was born in New York City on October 28, 1914. His parents, Daniel and Dora (née Press) Salk, were Ashkenazi Jewish; Daniel was born in New Jersey to eastern European immigrant parents, and Dora was born in Russia, immigrating when she was twelve. They had not received extensive formal education. He had