After decades of experimentation, Jonas Salk announced the first polio vaccine known as IPV, or inactivated polio vaccine, in 1953.

经过几十年的实验，乔纳斯·索尔克于 1953 年宣布研制出第一种脊髓灰质炎疫苗，IPV，即灭活脊髓灰质炎疫苗。