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  "notes": "The slide uses a hierarchical tree structure to decompose the problem of herd immunity into its constituent drivers.",
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      "text": "Herd immunity is the point at which enough people in a population have immune protection so that sustained transmission is no longer possible. Several factors influence the threshold for achieving herd immunity and our progress towards achieving it:",
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      "text": "1. Countries with higher levels of BCG vaccination have correlate with slower infection and death rates, but causation has not been proven\n2. Through monoclonals or polyclonals / plasms products\nSource: Information compiled from a variety of public statements and sources as well as surveys conducted by McKinsey and others, and interviews with relevant experts",
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