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Just read a biography of Jonas Salk and a major portion of it is devoted to the issue of the oral vaccine (OPV) versus the injected vaccine (IPV). Salk spent a
by scandox 6y ago
Just read a biography of Jonas Salk and a major portion of it is devoted to the issue of the oral vaccine (OPV) versus the injected vaccine (IPV).
Salk spent a large portion of his later life pressing for the OPV to be delicensed because he considered any risk of live vaccine infecting immuno-suppressed persons or of the weakened virus becoming reactivated unacceptable.
As I understand it the OPV was still in use in the US until 1999. It was an interesting case study in the different forces that kept a vaccine proven to cause some cases of Polio every year in use.