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      "scope": {
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      "statement": "# The Salk vaccine: a major step in preventing polio\n\nDevelopment, large-scale evaluation and licensing of an inactivated poliovirus vaccine made widespread preventive vaccination possible. The 1955 milestone was followed by other vaccine designs and extensive public-health programmes.\n\n## Scientific scope\n\nSalk is a named contributor, not the full trial, manufacturing or public-health roster. This entry covers the inactivated vaccine milestone; it does not claim polio was globally eradicated in 1955 or absorb Sabin’s later oral-vaccine work.\n\n## Reading status\n\nThis is a source-linked WRS catalogue note. A full explanatory guide and independent scientific reconstruction have not been completed for this entry. Read the identified original work for its complete narrative and arguments.\n\n## People and systems\n\nJonas Salk\n\nNamed source contributors; broader team, precursor or trial-group roster remains incomplete.\n\n\n\n## Original sources\n\n- [WHO: History of polio vaccination](https://www.who.int/news-room/spotlight/history-of-vaccination/history-of-polio-vaccination)\n",
      "summary": "Development, large-scale evaluation and licensing of an inactivated poliovirus vaccine made widespread preventive vaccination possible. The 1955 milestone was followed by other vaccine designs and extensive public-health programmes.",
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    "context": "Vaccination",
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