This interim guidance was initially issued in October 2020, based on advice from the Strategic Advisory Group of Experts (SAGE) on Immunization; it has been updated following the discussions at an extraordinary meeting of SAGE on 29 June 2021. A summary of the major revisions appears in Annex 3 (page 20), including evolving key assumptions and epidemiological considerations.
For further information, see below:
source https://www.who.int/news/item/16-07-2021-updated-who-sage-roadmap-for-prioritizing-uses-of-covid-19-vaccines-in-the-context-of-limited-supply
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