2019-S $1 American Innovation PA Polio Vaccine 1953, DCAM PR70DCAM 认证号38694187, PCGS号804669

2019-S American Innovation Dollar (Polio Vaccine 1953 - PA) PR70DCAM { PCGS-4 }. In 1947, the University of Pittsburgh hired Dr. Jonas Salk to develop a polio vaccine. At the time, polio was a devastating disease disproportionately affecting children and young adults, leaving many of them paralyzed. In 1953, the university announced that Salk’s team had discovered a vaccine they believed could prevent the disease. After two years of clinical trials, the first of which were conducted in southwestern Pennsylvania, the vaccine was determined to be safe and effective. Its subsequent, widespread administration to millions of Americans effectively eliminated polio and helped usher in a new era of virology. This coin features nicely rendered devices whose heavy frosting is contrasted spectacularly against the ample mirrored fields.