Vaccine Strain Polio Death in Minnesotaby
. The injected polio vaccine now in use contains only inactivated virus.
The patient died with symptoms...The live virus Oral Polio Vaccine (OPV), which is no longer used in the US but is used in places...
Polio vaccine, 50 years laterby
Fifty years ago Tuesday, on April 12, 1955, scientists announced that the polio vaccine developed...-long study of the vaccine, declared: "The vaccine works. It is safe, effective and potent."