Jonas Salk's Polio Vaccine Journey: 5 Major Obstacles Overcome
Salk's path to the inactivated polio vaccine (IPV, 1955) faced:
- Funding scarcity – relied on NFIP (March of Dimes) grants; limited lab space.
- Scientific skepticism – killed-virus approach doubted; live-attenuated (Sabin) favored by many.
- Viral complexity – 3 serotypes; needed formalin inactivation preserving immunogenicity.
- Safety rigor – massive field trial (1.8M children); Cutter incident (live virus in batches) → stricter regulation.
- Public pressure – polio panic demanded speed; Salk resisted premature release.
IPV eliminated wild polio in Americas by 1994; global eradication near.
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